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Lifeloggers have long touted the “total recall” that’s achievable if you obsessively store and organize personal records: Never forget a thing! But Wegener has found that less can be more. When you show someone their year-old check-ins and nothing else, it’s a very crude signal — just a bunch of points on a map. But our brains seize these cues and fill in the details

these techniques can also work with “semantic” memories of facts and info. Last winter, Amazon released a clever app called Daily Review, which takes your Kindle clippings and redisplays them for you weeks or months later — timed on a schedule that’s designed to help you absorb your reading more deeply into your brain

This tendency to see meaning in life events seems to reflect a more general aspect of human nature: our powerful drive to reason in psychological terms, to make sense of events and situations by appealing to goals, desires and intentions

This drive serves us well when we think about the actions of other people, who actually possess these psychological states, because it helps us figure out why people behave as they do and to respond appropriately.

But it can lead us into error when we overextend it, causing us to infer psychological states even when none exist. This fosters the illusion that the world itself is full of purpose and design.

we found that highly paranoid people (who tend to obsess over other people’s hidden motives and intentions) and highly empathetic people (who think deeply about other people’s goals and emotions) are particularly likely to believe in fate and to believe that there are hidden messages and signs embedded in their own life events. In other words, the more likely people are to think about other people’s purposes and intentions, the more likely they are to also infer purpose and intention in human life itself.

the belief also has some ugly consequences. It tilts us toward the view that the world is a fundamentally fair place, where goodness is rewarded and badness punished. It can lead us to blame those who suffer from disease and who are victims of crimes, and it can motivate a reflexive bias in favor of the status quo — seeing poverty, inequality and oppression as reflecting the workings of a deep and meaningful plan.

even those who are devout should agree that, at least here on Earth, things just don’t naturally work out so that people get what they deserve. If there is such a thing as divine justice or karmic retribution, the world we live in is not the place to find it. Instead, the events of human life unfold in a fair and just manner only when individuals and society work hard to make this happen.We should resist our natural urge to think otherwise.

“You see a woman like this and you say, ‘Wow, I want to look like her,’ ” said Reina Parada, as she sanded a mannequin torso in the workshop. Although she cannot afford it, she said, she would like to get implant surgery someday. “It gives you better self-esteem.”

Cosmetic procedures are so fashionable here that a woman with implants is often casually referred to as “an operated woman.” Women freely talk about their surgeries, and mannequin makers jokingly refer to the creations as being “operated” as well.

The embrace of plastic surgery clashes with the government’s socialist ideology and frequent talk of creating a society free of the taint of commercialism.

the world’s largest estimated petroleum reserves — has long fed a culture of easy money and consumerism here, along with a penchant for the quick fix and instant gratification.

“Venezuela is known for its oil, and it’s known for its beauty,”

Beauty took on a particularly important role in the late 1970s and ’80s when the country’s beauty queens, already a national obsession, were crowned Miss Universe three times.

And the beauty queens’ fame helped fuel a fascination with cosmetic surgery and procedures like breast implants, tummy tucks, nose jobs and injections to firm the buttocks.

For Mr. Sousa, beauty really is skin deep: “I say that inner beauty doesn’t exist. That’s something that unpretty women invented to justify themselves.”

new research has found that taking photos -- an increasingly ubiquitous practice in our smartphone-obsessed culture -- actually hinders our ability to remember that which we're capturing on camera.

most of us aren't able to effectively manage the overload of information we're constantly bombarded with.When the working memory is experiencing digital overload, it's like a glass of water overflowing.

when we know a digital device or tool will remember a piece of information for us, we're less likely to remember it ourselves.

He explained that an over-reliance on technology has a tendency to encourage us to isolate pieces of information without fitting them into a broader cognitive schema.

A 2013 Trending Machine national poll found that millennials (aged 18-34) are more likely than those over the age of 55 to forget what day it is (15 percent vs. 7 percent) and where they put their keys (14 percent vs. 8 percent).

Rousseau wrote about “amour-propre,” a kind of self-love based on the opinions of others. He considered it unnatural and unhealthy, and believed that arbitrary social comparison led to people wasting their lives trying to look and sound attractive to others.

Narcissus falls in love not with himself, but with his reflection. In the modern version, Narcissus would fall in love with his own Instagram feed, and starve himself to death while compulsively counting his followers.

If our egos are obese with amour-propre, social media can indeed serve up the empty emotional carbs we crave. Instagram and the like doesn’t create a narcissist, but studies suggest it acts as an accelerant — a near ideal platform to facilitate what psychologists call “grandiose exhibitionism.”

No doubt you have seen this in others, and maybe even a little of it in yourself as you posted a flattering selfie — and then checked back 20 times for “likes.”

A healthy self-love that leads to true happiness is what Rousseau called “amour de soi.” It builds up one’s intrinsic well-being, as opposed to feeding shallow cravings to be admired.

First, take the Narcissistic Personality Inventory test.

Here is an individual self-improvement strategy that combines a healthy self-love (for Valentine’s Day) with a small sacrifice (possibly for Lent).

Cultivating amour de soi requires being fully alive at this moment, as opposed to being virtually alive while wondering what others think. The soulful connection with another person, the enjoyment of a beautiful hike alone (not shared on Facebook) or a prayer of thanks over your sleeping child (absent a #blessed tweet) could be considered expressions of amour de soi.

Second, get rid of the emotional junk food that is feeding any unhealthy self-obsession. Make a list of opinions to disregard — especially those of flatterers and critics — and review the list each day. Resolve not to waste a moment trying to impress others,

Third, go on a social media fast. Post to communicate, praise and learn — never to self-promote.

As for clinically significant narcissism—along with greed, invidious prejudice, and habitual lying—it is simply another one of our anti-social behaviors that mutated from our basic genetic drives…in this case the drive to survive. The opposite of narcissism is empathy, a brain-wiring that evolved much later and in parallel with our increased reliance on social interaction as a means to improve the chances of sending our genes down the line (the drive to reproduce). There is thus a certain irony in the fact that the misnamed “social” media are encouraging a decline in empathy. Your thoughts?

Sure you're not confusing narcissism with vanity? If you've ever had the misfortune of having someone with narcissistic personality disorder in your life, you would know it's about more than selfies and seeking constant approval. They are truly sick individuals that destroy the lives of those they claim to love.I would say people's addictions to social media "likes" and posting selfies is vanity

Perhaps we need to distinguish between Narcissistic Personality Disorder (NPD) and the adjective "narcissistic." We all know lots of people with way too much self-regard. NPD on the other hand ruins lives and certainly families. People who have NPD are way beyond self centered. They see the world as black and white and all people they interact with become reflections. People with NPD go to extreme lengths to control those around them and will lie, cheat and steal to do that. They are never wrong the other person is always wrong. I have worked for Narcissists and lived with one. Let's not throw around this term without defining it, please.

Dr. Rose lays the blame for our modern obsession directly at the feet of Adolphe Quetelet, a 19th-century Belgian mathematician. Quetelet was an early data cruncher, the first to apply statistical tools to large groups of people

Among his accomplishments was devising the body mass index, a ratio of weight to height that we still use to decide if people are too big or small. For him, the average was the optimal; normal was the best thing any human could ever possibly be.

Not so for one of his intellectual heirs, Francis Galton of Britain, who agreed that averages were excellent tools for understanding individuals. Ultimately, though, he came to the conclusion that the average defined not the optimal but simply the mediocre, a mark to be measured only so that it could be surpassed.

“Typing and ranking have come to seem so elementary, natural and right that we are no longer conscious of the fact that every such judgment always erases the individuality of the person being judged,”

But anyone who works with people can cite case after case in which the standard metrics disappoin

For educators, it’s all those brilliant underachiever

For doctors, it’s all the outliers who survive dire disease predictors

But if we are not averagerians, then who are we?

he sets forth a variety of alternate principles. Among them is the not-unfamiliar notion that all human characteristics are multidimensional, not only in specifics but also in time and context.

In other words, big data may have landed us in the Age of Average, but really enormous data, with many observations of a single person’s biology and behavior taken over time and in different contexts, may yield a far better understanding of that individual than do group norms.

In life and in health, different pathways may lead to the same end.

Dr. Rose spends much of his narrative in the worlds of education and business, offering up examples of schools and companies that have defied the rule of the average, to the benefit of all. His argument will resonate in many other contexts, though: Readers will be moved to examine their own averagerian prejudices, most so ingrained as to be almost invisible, all worthy of review.

It’s true there are “extremists on both sides,” but as this Wonk Blog post showed, the percentage of non-centrist Republicans skyrocketed from under 10 percent in the Ford years (less than Democrats) to almost 90 percent today, while the Democratic percentage has stayed basically flat [chart].

What’s more, in the last session (2013-2014), the data shows that 147 House Republicans — more than half the caucus — were more ideologically extreme than the most extreme Democrat in the House. There is simply no comparison between the two partie

But it’s a fact that “balanced” journalism has to ignore. To admit that the political world isn’t balanced would shake their whole belief system to its core. And yet, the shaking seems to have begun

The GOP’s strategic logic is simple and straightforward: If the media is going to split the difference between what Democrats and Republicans say, then if Republicans simply double their demands, suddenly the media, embracing the “sensible center,” will now articulate the old GOP position as the “sensible center,” the “common sense” place to be

Their stubborn adherence to a false balance narrative has, ironically, become an integral part of the GOP’s relentless rightward push. By talking about “government dysfunction” instead of “Republican obstruction,” the media actively helps the most extreme anti-government Republicans thwart any efforts at competent governance and it helps promote their “government is horrible” worldview

There was once a penalty for becoming too politically extreme: one’s actions would be characterized as unrealistic, destructive, heedless of past experience, etc. Sometimes this was justified, sometimes not (as with the Civil Rights movement). But right or wrong, this media practice inhibited radical movements in either direction.

For quite some time now, however, conservative Republicans have realized that by moving right and attacking the media for any criticism, they can turn the media into a tacit ally, forcing them to treat preposterous claims as serious ideas, or even proven facts

Norm’s response underscores the reality of asymmetric polarization, which the mainstream media and most good government groups have avoided discussing — at great costs to the country

Thus, when they were planning to force a government shutdown, a key part of their strategy was spinning the media with a preposterous argument that it was the Democrats who were shutting down the government, even though, as the New York Times reported, the shutdown plan traced back to a meeting early in President Obama’s second term, led by former Attorney General Edwin R. Meese.

What’s more, once the media plays along, it’s a trick that can be used over and over again. One can keep moving farther and farther right indefinitely, pulling the “objective” media along for the ride, every step of the way. (Conservatives even developed an operational model to describe the process, known as the “Overton Window,” explained by a conservative activist here.)

The basis for all this is a cultural illusion that the “nonpartisan” media is somehow objective, philosophically in tune with science.

historically, this is far from true. Up until the late 19th century, American journalism was quite partisan, serving substantial “niche” audiences, sustained by subscriptions.

hen advertising exploded as a revenue source in the early 20th century, a new journalistic model emerged, trying to appeal across parties, while taking care not to anger large advertisers. The broader story is well told by Paul Starr in “The Creation of the Media

Jeremy Iggers incorporates this history into his account of how journalism ethics confuses the purposes of journalism in “Good News, Bad News: Journalism Ethics and the Public Interest.”

Such is the basis for the media’s claims of “objectivity.” Starr’s history explains the forces leading to why this happened.

the blogosphere’s origins were not just Usenet, email lists and the like, they were also the underground press tracing back to IF Stone’s Weekly and George Seldes’ In Fact; the black press, both commercial and movement-based; political journals of the left and right; and so on

These underappreciated traditions provide largely untapped examples of how to do quality political journalism outside of the artificial construct in which false balance is rooted. They point the way forward for us, beyond our current state of asymmetrical dysfunction.

There are plenty of theories, of course, especially regarding why: increasingly complex social networks, a culture built around tool use and collaboration, the challenge of adapting to a mercurial and often harsh climate

Although these possibilities are fascinating, they are extremely difficult to test.

Although it makes up only 2 percent of body weight, the human brain consumes a whopping 20 percent of the body’s total energy at rest. In contrast, the chimpanzee brain needs only half that.

contrary to long-standing assumptions, larger mammalian brains do not always have more neurons, and the ones they do have are not always distributed in the same way.

The human brain has 86 billion neurons in all: 69 billion in the cerebellum, a dense lump at the back of the brain that helps orchestrate basic bodily functions and movement; 16 billion in the cerebral cortex, the brain’s thick corona and the seat of our most sophisticated mental talents, such as self-awareness, language, problem solving and abstract thought; and 1 billion in the brain stem and its extensions into the core of the brain

In contrast, the elephant brain, which is three times the size of our own, has 251 billion neurons in its cerebellum, which helps manage a giant, versatile trunk, and only 5.6 billion in its cortex

primates evolved a way to pack far more neurons into the cerebral cortex than other mammals did

The great apes are tiny compared to elephants and whales, yet their cortices are far denser: Orangutans and gorillas have 9 billion cortical neurons, and chimps have 6 billion. Of all the great apes, we have the largest brains, so we come out on top with our 16 billion neurons in the cortex.

“What kinds of mutations occurred, and what did they do? We’re starting to get answers and a deeper appreciation for just how complicated this process was.”

there was a strong evolutionary pressure to modify the human regulatory regions in a way that sapped energy from muscle and channeled it to the brain.

Accounting for body size and weight, the chimps and macaques were twice as strong as the humans. It’s not entirely clear why, but it is possible that our primate cousins get more power out of their muscles than we get out of ours because they feed their muscles more energy. “Compared to other primates, we lost muscle power in favor of sparing energy for our brains,” Bozek said. “It doesn’t mean that our muscles are inherently weaker. We might just have a different metabolism.

a pioneering experiment. Not only were they going to identify relevant genetic mutations from our brain’s evolutionary past, they were also going to weave those mutations into the genomes of lab mice and observe the consequences.

Silver and Wray introduced the chimpanzee copy of HARE5 into one group of mice and the human edition into a separate group. They then observed how the embryonic mice brains grew.

After nine days of development, mice embryos begin to form a cortex, the outer wrinkly layer of the brain associated with the most sophisticated mental talents. On day 10, the human version of HARE5 was much more active in the budding mice brains than the chimp copy, ultimately producing a brain that was 12 percent larger

“It wasn’t just a couple mutations and—bam!—you get a bigger brain. As we learn more about the changes between human and chimp brains, we realize there will be lots and lots of genes involved, each contributing a piece to that. The door is now open to get in there and really start understanding. The brain is modified in so many subtle and nonobvious ways.”

As recent research on whale and elephant brains makes clear, size is not everything, but it certainly counts for something. The reason we have so many more cortical neurons than our great-ape cousins is not that we have denser brains, but rather that we evolved ways to support brains that are large enough to accommodate all those extra cells.

There’s a danger, though, in becoming too enamored with our own big heads. Yes, a large brain packed with neurons is essential to what we consider high intelligence. But it’s not sufficient

No matter how large the human brain grew, or how much energy we lavished upon it, it would have been useless without the right body. Three particularly crucial adaptations worked in tandem with our burgeoning brain to dramatically increase our overall intelligence: bipedalism, which freed up our hands for tool making, fire building and hunting; manual dexterity surpassing that of any other animal; and a vocal tract that allowed us to speak and sing.

Human intelligence, then, cannot be traced to a single organ, no matter how large; it emerged from a serendipitous confluence of adaptations throughout the body. Despite our ongoing obsession with the size of our noggins, the fact is that our intelligence has always been so much bigger than our brain.

As a philosopher, I have nothing to add to the scientific evidence of global warming, but I can tell you how it’s possible to get ourselves to sincerely doubt things, despite abundant evidence to the contrary

scenarios suggest that it’s possible to feel as though you don’t know something even when possessing enormous evidence in its favor. Philosophers call scenarios like these “skeptical pressure” cases

In general, a skeptical pressure case is a thought experiment in which the protagonist has good evidence for something that he or she believes, but the reader is reminded that the protagonist could have made a mistake

If the story is set up in the right way, the reader will be tempted to think that the protagonist’s belief isn’t genuine knowledge

When presented with these thought experiments, some philosophy students conclude that what these examples show is that knowledge requires full-blown certainty. In these skeptical pressure cases, the evidence is overwhelming, but not 100 percent. It’s an attractive idea, but it doesn’t sit well with the fact that we ordinarily say we know lots of things with much lower probability.

Although there is no consensus about how it arises, a promising idea defended by the philosopher David Lewis is that skeptical pressure cases often involve focusing on the possibility of error. Once we start worrying and ruminating about this possibility, no matter how far-fetched, something in our brains causes us to doubt. The philosopher Jennifer Nagel aptly calls this type of effect “epistemic anxiety.”

In my own work, I have speculated that an extreme version of this phenomenon is operative in obsessive compulsive disorder

The standard response by climate skeptics is a lot like our reaction to skeptical pressure cases. Climate skeptics understand that 97 percent of scientists disagree with them, but they focus on the very tiny fraction of holdouts. As in the lottery case, this focus might be enough to sustain their skepticism.

Anti-vaccine proponents, for example, aware that medical professionals disagree with their position, focus on any bit of fringe research that might say otherwise.

Skeptical allure can be gripping. Piling on more evidence does not typically shake you out of it, just as making it even more probable that you will lose the lottery does not all of a sudden make you feel like you know your ticket is a loser.

One way to counter the effects of skepticism is to stop talking about “knowledge” and switch to talking about probabilities. Instead of saying that you don’t know some claim, try to estimate the probability that it is true. As hedge fund managers, economists, policy researchers, doctors and bookmakers have long been aware, the way to make decisions while managing risk is through probabilities.

Once we switch to this perspective, claims to “not know,” like those made by Trump, lose their force and we are pushed to think more carefully about the existing data and engage in cost-benefit analyses.

It’s easy to say you don’t know, but it’s harder to commit to an actual low probability estimate in the face of overwhelming contrary evidence.

Socrates was correct that awareness of one’s ignorance is virtuous, but philosophers have subsequently uncovered many pitfalls associated with claims of ignorance. An appreciation of these issues can help elevate public discourse on important topics, including the future of our planet.

And while empirical evidence is important and we need more of it, the data almost never speak for themselves – a point amply illustrated by recent monetary events.

chwinger, as I remember the story, was never seen to use a Feynman diagram. But he had a locked room in his house, and the rumor was that that room was where he kept the Feynman diagrams he used in secret.

What’s the equivalent of Feynman diagrams? Something like IS-LM, which is the simplest model you can write down of how interest rates and output are jointly determined, and is how most practicing macroeconomists actually think about short-run economic fluctuations. It’s also how they talk about macroeconomics to each other. But it’s not what they put in their papers, because the journals demand that your model have “microfoundations.”

The Bernanke Fed massively expanded the monetary base, by a factor of almost five. There were dire warnings that this would cause inflation and “debase the dollar.” But prices went nowhere, and not much happened to broader monetary aggregates (a result that, weirdly, some economists seemed to find deeply puzzling even though it was exactly what should have been expected.)

What about fiscal policy? Traditional macro said that at the zero lower bound there would be no crowding out – that deficits wouldn’t drive up interest rates, and that fiscal multipliers would be larger than under normal conditions. The first of these predictions was obviously borne out, as rates stayed low even when deficits were very large. The second prediction is a bit harder to test, for reasons I’ll get into when I talk about the limits of empiricism. But the evidence does indeed suggest large positive multipliers.

The overall story, then, is one of overwhelming predictive success. Basic, old-fashioned macroeconomics didn’t fail in the crisis – it worked extremely well

In fact, it’s hard to think of any other example of economic models working this well – making predictions that most non-economists (and some economists) refused to believe, indeed found implausible, but which came true. Where, for example, can you find any comparable successes in microeconomics?

Meanwhile, the demand that macro become ever more rigorous in the narrow, misguided sense that it look like micro led to useful approaches being locked up in Schwinger’s back room, and in all too many cases forgotten. When the crisis struck, it was amazing how many successful academics turned out not to know things every economist would have known in 1970, and indeed resurrected 1930-vintage fallacies in the belief that they were profound insights.

mainly I think it reflected the general unwillingness of human beings (a category that includes many though not necessarily all economists) to believe that so many people can be so wrong about something so big.

. To normal human beings the study of international trade and that of international macroeconomics might sound like pretty much the same thing. In reality, however, the two fields used very different models, had very different intellectual cultures, and tended to look down on each other. Trade people tended to consider international macro people semi-charlatans, doing ad hoc stuff devoid of rigor. International macro people considered trade people boring, obsessed with proving theorems and offering little of real-world use.

does microeconomics really deserve its reputation of moral and intellectual superiority? No

Even before the rise of behavioral economics, any halfway self-aware economist realized that utility maximization – indeed, the very concept of utility — wasn’t a fact about the world; it was more of a thought experiment, whose conclusions should always have been stated in the subjunctive.

But, you say, we didn’t see the Great Recession coming. Well, what do you mean “we,” white man? OK, what’s true is that few economists realized that there was a huge housing bubble

True, a model doesn’t have to be perfect to provide hugely important insights. But here’s my question: where are the examples of microeconomic theory providing strong, counterintuitive, successful predictions on the same order as the success of IS-LM macroeconomics after 2008? Maybe there are some, but I can’t come up with any.

The point is not that micro theory is useless and we should stop doing it. But it doesn’t deserve to be seen as superior to macro modeling.

And the effort to make macro more and more like micro – to ground everything in rational behavior – has to be seen now as destructive. True, that effort did lead to some strong predictions: e.g., only unanticipated money should affect real output, transitory income changes shouldn’t affect consumer spending, government spending should crowd out private demand, etc. But all of those predictions have turned out to be wrong.

Kahneman and Tversky and Thaler and so on deserved all the honors they received for helping to document the specific ways in which utility maximization falls short, but even before their work we should never have expected perfect maximization to be a good description of reality.

But data never speak for themselves, for a couple of reasons. One, which is familiar, is that economists don’t get to do many experiments, and natural experiments are rare

The other problem is that even when we do get something like natural experiments, they often took place under economic regimes that aren’t relevant to current problems.

Both of these problems were extremely relevant in the years following the 2008 crisis.

you might be tempted to conclude that the empirical evidence is that monetary expansion is inflationary, indeed roughly one-for-one.

But the question, as the Fed embarked on quantitative easing, was what effect this would have on an economy at the zero lower bound. And while there were many historical examples of big monetary expansion, examples at the ZLB were much rarer – in fact, basically two: the U.S. in the 1930s and Japan in the early 2000

These examples told a very different story: that expansion would not, in fact, be inflationary, that it would work out the way it did.

The point is that empirical evidence can only do certain things. It can certainly prove that your theory is wrong! And it can also make a theory much more persuasive in those cases where the theory makes surprising predictions, which the data bear out. But the data can never absolve you from the necessity of having theories.

Over this past decade, I’ve watched a number of economists try to argue from authority: I am a famous professor, therefore you should believe what I say. This never ends well. I’ve also seen a lot of nihilism: economists don’t know anything, and we should tear the field down and start over.

Obviously I differ with both views. Economists haven’t earned the right to be snooty and superior, especially if their reputation comes from the ability to do hard math: hard math has been remarkably little help lately, if ever.

On the other hand, economists do turn out to know quite a lot: they do have some extremely useful models, usually pretty simple ones, that have stood up well in the face of evidence and events. And they definitely shouldn’t defer to important and/or rich people on polic

: compare Janet Yellen’s macroeconomic track record with that of the multiple billionaires who warned that Bernanke would debase the dollar. Or take my favorite Business Week headline from 2010: “Krugman or [John] Paulson: Who You Gonna Bet On?” Um.The important thing is to be aware of what we do know, and why.Follow The New York Times Opinion section on Facebook and Twitter (@NYTopinion), and sign up for the Opinion Today newsletter.

Live Nation Rules Music Ticketing, Some Say With Threats

To the Stoics, contributing to public affairs was a critical duty of the philosopher. Could Seneca decline to serve because he disagreed with the emperor? Could he leave a deranged Nero unsupervised? In time, Seneca would also come to the conclusion that when “the state is so rotten as to be past helping, if evil has entire dominion over it, the wise man will not labor in vain or waste his strength in unprofitable efforts.”

My own early career involved some questionable service to businesspeople. Employed and paid by them, I planned and carried out controversial publicity stunts, and used dishonest tactics with the public and the media. When I finally left those roles, I found a knowledge of Stoic philosophy integral to my ability to assess my past actions, and set a more honorable course going forward.

Seneca seemed to realize only belatedly that one can contribute to his fellow citizens in ways other than through the state — for instance, by writing or simply by being a good man at home.

In 65 A.D., Seneca would again find that philosophy did not exist only in the ethereal world. Conspirators began to plot against Nero’s life, and Seneca, finally accepting that the monster he had helped create needed to be stopped, appears to have participated — or covered for those who did.

The effort failed but provided Seneca an opportunity: His life up to that point had contradicted many of his own teachings, but now when Nero’s guards came and demanded his life, he would be brave and wise. The man who had written much about learning how to die and facing the end without fear would comfort his friends, finish an essay he was writing and distribute some finished pieces for safekeeping. Then, he slit his veins, took hemlock and succumbed to the suffocating steam of a bath.

There are other avenues still, said Jascha Kaykas-Wolff, the chief marketing officer of Mozilla, the nonprofit organization behind the popular Firefox browser, including advertisers and large tech platforms collecting vastly less user data and still effectively customizing ads to consumers.

The greatest likelihood is that the internet companies, frightened by the tumult, will accept a few more rules and work a little harder for transparency.

The Cambridge Analytica case, said Vera Jourova, the European Union commissioner for justice, consumers and gender equality, was not just a breach of private data. “This is much more serious, because here we witness the threat to democracy, to democratic plurality,” she said.

Although many people had a general understanding that free online services used their personal details to customize the ads they saw, the latest controversy starkly exposed the machinery.

Consumers’ seemingly benign activities — their likes — could be used to covertly categorize and influence their behavior. And not just by unknown third parties. Facebook itself has worked directly with presidential campaigns on ad targeting, describing its services in a company case study as “influencing voters.”

“If your personal information can help sway elections, which affects everyone’s life and societal well-being, maybe privacy does matter after all.”

some trade group executives also warned that any attempt to curb the use of consumer data would put the business model of the ad-supported internet at risk.

“You’re undermining a fundamental concept in advertising: reaching consumers who are interested in a particular product,”

If suspicion of Facebook and Google is a relatively new feeling in the United States, it has been embedded in Europe for historical and cultural reasons that date back to the Nazi Gestapo, the Soviet occupation of Eastern Europe and the Cold War.

“We’re at an inflection point, when the great wave of optimism about tech is giving way to growing alarm,” said Heather Grabbe, director of the Open Society European Policy Institute. “This is the moment when Europeans turn to the state for protection and answers, and are less likely than Americans to rely on the market to sort out imbalances.”

In May, the European Union is instituting a comprehensive new privacy law, called the General Data Protection Regulation. The new rules treat personal data as proprietary, owned by an individual, and any use of that data must be accompanied by permission — opting in rather than opting out — after receiving a request written in clear language, not legalese.

the protection rules will have more teeth than the current 1995 directive. For example, a company experiencing a data breach involving individuals must notify the data protection authority within 72 hours and would be subject to fines of up to 20 million euros or 4 percent of its annual revenue.

“With the new European law, regulators for the first time have real enforcement tools,” said Jeffrey Chester, the executive director of the Center for Digital Democracy, a nonprofit group in Washington. “We now have a way to hold these companies accountable.”

Privacy advocates and even some United States regulators have long been concerned about the ability of online services to track consumers and make inferences about their financial status, health concerns and other intimate details to show them behavior-based ads. They warned that such microtargeting could unfairly categorize or exclude certain people.

the Do Not Track effort and the privacy bill were both stymied.Industry groups successfully argued that collecting personal details posed no harm to consumers and that efforts to hinder data collection would chill innovation.

“If it can be shown that the current situation is actually a market failure and not an individual-company failure, then there’s a case to be made for federal regulation” under certain circumstances

The business practices of Facebook and Google were reinforced by the fact that no privacy flap lasted longer than a news cycle or two. Nor did people flee for other services. That convinced the companies that digital privacy was a dead issue.

If the current furor dies down without meaningful change, critics worry that the problems might become even more entrenched. When the tech industry follows its natural impulses, it becomes even less transparent.

“To know the real interaction between populism and Facebook, you need to give much more access to researchers, not less,” said Paul-Jasper Dittrich, a German research fellow

There’s another reason Silicon Valley tends to be reluctant to share information about what it is doing. It believes so deeply in itself that it does not even think there is a need for discussion. The technology world’s remedy for any problem is always more technology

there is a plausible reading of Trump’s words that refers to the gang, or similar criminals, not to immigrants in general. But in light of Trump’s history, that surface reading isn’t enough.

the “animals” controversy illustrates a broader truth: It’s a common human failing to characterize outgroups by the worst examples we can find while dismissing our own bad apples as isolated minorities who have nothing to do with the rest of us.

It’s instructive to compare Trump’s harsh language about immigrant “animals” with his response to a direct question about a different group of people behaving badly. After white nationalists staged marches in Charlottesville, culminating in a death, Trump was at pains to distinguish the Nazis from the “people in that group that were there to innocently protest.”

He’s less careful when immigrants are involved. Immigrants actually have a lower crime rate than native-born Americans , yet Trump sure seems to spend an awful lot of time talking about the small fraction who are criminals.

in the succeeding days, he has seemed obsessed with repeating the word “animals” every time the social media storm threatened to die down.

Consider how conservatives feel, for example, when the left focuses disproportionate energy on the tiny portion of the population that belongs to the alt-right or to white-nationalist groups.

Or consider the lingering indignation over Barack Obama’s suggestion that in some small towns in the Midwest and Pennsylvania, where the economy has been devastated by de-industrialization, some people “get bitter, they cling to guns or religion or antipathy to people who aren’t like them.”

Obama wasn’t making an abstract observation about human psychology; he was implying that while Democrats come to their views through thoughtful reflection, the Republican rubes simply react to environmental stimulus, like amoebas.

“Slang may not represent us at our best, or our most admirable, but it represents us as human beings with anger, fear, self-aggrandisement, and our obsession with sex and bodily parts.”

This clever, playful use of metaphor would come to define anti-languages for Halliday. As you could see from the dialogue between the two Elizabethan ruffians, the strange, nonsensical words render a sentence almost impossible to comprehend for outsiders, and the more terms you have, the harder it is for an outsider to learn the code. It is the reason that selling words to the police can be heavily punished among underworld gangs.

All borrow the grammar of the mother language but replace words (“London”, “purse”, “money”, “alehouse”) with another, elliptical term (“Rome”, “bounge”, “lower”, “bowsing ken”). Often, the anti-language may employ dozens of terms that have blossomed from a single concept – a feature known as “over-lexicalisation”. Halliday points to at least 20 terms that Elizabethan criminals used to describe fellow thieves, for instance

Similarly, the Kolkata underworld had 41 words for police and more than 20 for bomb. Each anti-society may have its own way of generating new terms; often the terms are playful metaphors (such as “bawdy basket”), but they can also be formed from existing words by swapping around or inserting syllables – “face” might become “ecaf”, for instance.

striking similarities in the patois spoken by all three underground groups and the ways it shaped their interactions.

“The better you are, the higher the status between those users,” explains Martin Montgomery, author of An Introduction to Language and Society.

Halliday doubted that secrecy was the only motive for building an anti-language, though; he found that it also helps define a hierarchy within the “anti-society”. Among the Polish prisoners, refusing to speak the lingo could denigrate you to the lowest possible rung of the social ladder, the so-called “suckers”.

The concept of an anti-language throws light on many of the vibrant slangs at the edges of society, from Cockney rhyming slang and Victorian “Gobbledygook” to the “Mobspeak” of the Mafia and “Boobslang” found uniquely in New Zealand prisons. The breadth and range of the terms can be astonishing; a lexicography of Boobslang reaches more than 200 pages, with 3,000 entries covering many areas of life.

Consider Polari. Incorporating elements of criminal cants, the gypsy Romani language, and Italian words, it was eventually adopted by the gay community of early 20th Century Britain, when homosexuality was still illegal. (Taking a “vada” at a “bona omi” for instance, means take a look at the good-looking man). Dropping an innocent term into a conversation would have been a way of identifying another gay man, without the risk of incriminating yourself among people who were not in the know.

His success is a startling illustration of the power of an anti-language to subvert – using the establishment's prudish "Auntie"  to broadcast shocking scenes of gay culture, two years before the Sexual Offences Act decriminalised homosexuality. The show may have only got the green light thanks to the fact that the radio commissioners either didn’t understand the connotations

the song Girl Loves Me on David Bowie’s latest album was written as a combination of Polari and Nadsat, the fictional anti-language in Anthony Burgess’s A Clockwork Orange.

Montgomery thinks we can see a similar process in the lyrics of hip-hop music. As with the other anti-languages, you can witness the blossoming of words for the illegal activities that might accompany gang culture. “There are so many words for firearm, for different kinds of drug, for money,”

Again, the imaginitive terms lend themselve to artistic use. “There’s quite often a playful element you elaborate new terms for old,” Montgomery says. “To use broccoli as a word for a drug – you take a word from the mainstream and convert it to new use and it has semi-humorous twist to it.”

He thinks that the web will only encourage the creation of slang that share some of the qualities of anti-languages; you just need to look at the rich online vocabulary that has emerged to describe prostitution;

new, metaphorical forms of speech will also proliferate in areas threatened by state censorship; already, you can see a dozen euphemisms flourishing in place of every term that is blocked from a search engine or social network.  If we can learn anything from this rich history of criminal cants, it is the enormous resilience of human expression in the face of oppression.

the trends persisted, across several years and a series of national surveys. The changes weren’t just in degree, but in kind.

The biggest difference between the Millennials and their predecessors was in how they viewed the world; teens today differ from the Millennials not just in their views but in how they spend their time. The experiences they have every day are radically different from those of the generation that came of age just a few years before them.

it was exactly the moment when the proportion of Americans who owned a smartphone surpassed 50 percent.

theirs is a generation shaped by the smartphone and by the concomitant rise of social media. I call them iGen

Born between 1995 and 2012, members of this generation are growing up with smartphones, have an Instagram account before they start high school, and do not remember a time before the internet.

iGen’s oldest members were early adolescents when the iPhone was introduced, in 2007, and high-school students when the iPad entered the scene, in 2010. A 2017 survey of more than 5,000 American teens found that three out of four owned an iPhone.

. I had grown accustomed to line graphs of trends that looked like modest hills and valleys. Then I began studying Athena’s generation.

More comfortable in their bedrooms than in a car or at a party, today’s teens are physically safer than teens have ever been. They’re markedly less likely to get into a car accident and, having less of a taste for alcohol than their predecessors, are less susceptible to drinking’s attendant ills.

Psychologically, however, they are more vulnerable than Millennials were: Rates of teen depression and suicide have skyrocketed since 2011. It’s not an exaggeration to describe iGen as being on the brink of the worst mental-health crisis in decades. Much of this deterioration can be traced to their phones.

the twin rise of the smartphone and social media has caused an earthquake of a magnitude we’ve not seen in a very long time, if ever. There is compelling evidence that the devices we’ve placed in young people’s hands are having profound effects on their lives—and making them seriously unhappy.

But the allure of independence, so powerful to previous generations, holds less sway over today’s teens, who are less likely to leave the house without their parents. The shift is stunning: 12th-graders in 2015 were going out less often than eighth-graders did as recently as 2009.

Today’s teens are also less likely to date. The initial stage of courtship, which Gen Xers called “liking” (as in “Ooh, he likes you!”), kids now call “talking”—an ironic choice for a generation that prefers texting to actual conversation. After two teens have “talked” for a while, they might start dating.

only about 56 percent of high-school seniors in 2015 went out on dates; for Boomers and Gen Xers, the number was about 85 percent.

The decline in dating tracks with a decline in sexual activity. The drop is the sharpest for ninth-graders, among whom the number of sexually active teens has been cut by almost 40 percent since 1991. The average teen now has had sex for the first time by the spring of 11th grade, a full year later than the average Gen Xer

The teen birth rate hit an all-time low in 2016, down 67 percent since its modern peak, in 1991.

Nearly all Boomer high-school students had their driver’s license by the spring of their senior year; more than one in four teens today still lack one at the end of high school.

In conversation after conversation, teens described getting their license as something to be nagged into by their parents—a notion that would have been unthinkable to previous generations.

In the late 1970s, 77 percent of high-school seniors worked for pay during the school year; by the mid-2010s, only 55 percent did. The number of eighth-graders who work for pay has been cut in half.

Beginning with Millennials and continuing with iGen, adolescence is contracting again—but only because its onset is being delayed. Across a range of behaviors—drinking, dating, spending time unsupervised— 18-year-olds now act more like 15-year-olds used to, and 15-year-olds more like 13-year-olds. Childhood now stretches well into high school.

In an information economy that rewards higher education more than early work history, parents may be inclined to encourage their kids to stay home and study rather than to get a part-time job. Teens, in turn, seem to be content with this homebody arrangement—not because they’re so studious, but because their social life is lived on their phone. They don’t need to leave home to spend time with their friends.

eighth-, 10th-, and 12th-graders in the 2010s actually spend less time on homework than Gen X teens did in the early 1990s.

The time that seniors spend on activities such as student clubs and sports and exercise has changed little in recent years. Combined with the decline in working for pay, this means iGen teens have more leisure time than Gen X teens did, not less.

So what are they doing with all that time? They are on their phone, in their room, alone and often distressed.

despite spending far more time under the same roof as their parents, today’s teens can hardly be said to be closer to their mothers and fathers than their predecessors were. “I’ve seen my friends with their families—they don’t talk to them,” Athena told me. “They just say ‘Okay, okay, whatever’ while they’re on their phones. They don’t pay attention to their family.” Like her peers, Athena is an expert at tuning out her parents so she can focus on her phone.

The number of teens who get together with their friends nearly every day dropped by more than 40 percent from 2000 to 2015; the decline has been especially steep recently.

Eighth-graders who are heavy users of social media increase their risk of depression by 27 percent, while those who play sports, go to religious services, or even do homework more than the average teen cut their risk significantly.

The roller rink, the basketball court, the town pool, the local necking spot—they’ve all been replaced by virtual spaces accessed through apps and the web.

The results could not be clearer: Teens who spend more time than average on screen activities are more likely to be unhappy, and those who spend more time than average on nonscreen activities are more likely to be happy.

There’s not a single exception. All screen activities are linked to less happiness, and all nonscreen activities are linked to more happiness

Eighth-graders who spend 10 or more hours a week on social media are 56 percent more likely to say they’re unhappy than those who devote less time to social media

If you were going to give advice for a happy adolescence based on this survey, it would be straightforward: Put down the phone, turn off the laptop, and do something—anything—that does not involve a screen

Social-networking sites like Facebook promise to connect us to friends. But the portrait of iGen teens emerging from the data is one of a lonely, dislocated generation. Teens who visit social-networking sites every day but see their friends in person less frequently are the most likely to agree with the statements “A lot of times I feel lonely,” “I often feel left out of things,” and “I often wish I had more good friends.” Teens’ feelings of loneliness spiked in 2013 and have remained high since.

This doesn’t always mean that, on an individual level, kids who spend more time online are lonelier than kids who spend less time online.

Teens who spend more time on social media also spend more time with their friends in person, on average—highly social teens are more social in both venues, and less social teens are less so.

The more time teens spend looking at screens, the more likely they are to report symptoms of depression.

It’s not only a matter of fewer kids partying; fewer kids are spending time simply hanging out

Teens who spend three hours a day or more on electronic devices are 35 percent more likely to have a risk factor for suicide, such as making a suicide plan. (That’s much more than the risk related to, say, watching TV.)

Since 2007, the homicide rate among teens has declined, but the suicide rate has increased. As teens have started spending less time together, they have become less likely to kill one another, and more likely to kill themselves. In 2011, for the first time in 24 years, the teen suicide rate was higher than the teen homicide rate.

For all their power to link kids day and night, social media also exacerbate the age-old teen concern about being left out.

Today’s teens may go to fewer parties and spend less time together in person, but when they do congregate, they document their hangouts relentlessly—on Snapchat, Instagram, Facebook. Those not invited to come along are keenly aware of it. Accordingly, the number of teens who feel left out has reached all-time highs across age groups.

Forty-eight percent more girls said they often felt left out in 2015 than in 2010, compared with 27 percent more boys. Girls use social media more often, giving them additional opportunities to feel excluded and lonely when they see their friends or classmates getting together without them.

Social media levy a psychic tax on the teen doing the posting as well, as she anxiously awaits the affirmation of comments and likes. When Athena posts pictures to Instagram, she told me, “I’m nervous about what people think and are going to say. It sometimes bugs me when I don’t get a certain amount of likes on a picture.”

Girls have also borne the brunt of the rise in depressive symptoms among today’s teens. Boys’ depressive symptoms increased by 21 percent from 2012 to 2015, while girls’ increased by 50 percent—more than twice as much

The rise in suicide, too, is more pronounced among girls. Although the rate increased for both sexes, three times as many 12-to-14-year-old girls killed themselves in 2015 as in 2007, compared with twice as many boys

Social media give middle- and high-school girls a platform on which to carry out the style of aggression they favor, ostracizing and excluding other girls around the clock.

I asked my undergraduate students at San Diego State University what they do with their phone while they sleep. Their answers were a profile in obsession. Nearly all slept with their phone, putting it under their pillow, on the mattress, or at the very least within arm’s reach of the bed. They checked social media right before they went to sleep, and reached for their phone as soon as they woke up in the morning

the smartphone is cutting into teens’ sleep: Many now sleep less than seven hours most nights. Sleep experts say that teens should get about nine hours of sleep a night; a teen who is getting less than seven hours a night is significantly sleep deprived

Fifty-seven percent more teens were sleep deprived in 2015 than in 1991. In just the four years from 2012 to 2015, 22 percent more teens failed to get seven hours of sleep.

Two national surveys show that teens who spend three or more hours a day on electronic devices are 28 percent more likely to get less than seven hours of sleep than those who spend fewer than three hours, and teens who visit social-media sites every day are 19 percent more likely to be sleep deprived.

Teens who read books and magazines more often than the average are actually slightly less likely to be sleep deprived—either reading lulls them to sleep, or they can put the book down at bedtime.

Sleep deprivation is linked to myriad issues, including compromised thinking and reasoning, susceptibility to illness, weight gain, and high blood pressure. It also affects mood: People who don’t sleep enough are prone to depression and anxiety.

correlations between depression and smartphone use are strong enough to suggest that more parents should be telling their kids to put down their phone.

What’s at stake isn’t just how kids experience adolescence. The constant presence of smartphones is likely to affect them well into adulthood. Among people who suffer an episode of depression, at least half become depressed again later in life. Adolescence is a key time for developing social skills; as teens spend less time with their friends face-to-face, they have fewer opportunities to practice them

Significant effects on both mental health and sleep time appear after two or more hours a day on electronic devices. The average teen spends about two and a half hours a day on electronic devices. Some mild boundary-setting could keep kids from falling into harmful habits.

Even if the doctors couldn’t pin down what was going on with me, I was so alarmed by my symptoms and the doctors’ gravest guesses that I felt anxious about whether or not I would have a future.

What was certain is that I was shrinking. Rapidly, uncontrollably.

My clothes hung loose at the waist and sloughed off my shoulders as if they belonged to a stranger, so I bought a stranger’s dress. Kate Spade, $348 retail.

I found it for $50 at an online designer consignment store while on hold with the hospital; a nurse was checking on the results of my bone marrow biopsy.

Online shopping was the sort of thing one might do if she were on hold with her cable company, not awaiting a possible blood cancer diagnosis.

I filled my cart with a cobalt dress, a blush silk blouse, a slinky skirt.

On paper, the doctors said, it looked like it could be lymphoma. The symptoms were classic: fever, night sweats, weight loss.

A biopsy of my enlarged lymph node showed it to be benign.

Two weeks earlier, a doctor had taken a surgical drill to my hip and hollowed out my bones with a syringe fit for a large horse. “Painful” was a deficient descriptor.

“I just don’t know what else to do,” my doctor said.

I sat still while my insides turned over. A cold sweat crept across my face. I closed my eyes, shook my head and returned to my shopping cart. I was not going to dwell.

No — I was going to shop. I was going to shop until I could think of nothing else. I punched in my credit card number and bought the Kate Spade.

Then I rushed to my closet, threw open the double doors and began rifling through Target impulse buys and ill-fitting hand-me-down

we’ll have to keep looking

I couldn’t breathe. I couldn’t do illness anymore. I could only do this.

I spun around in it, watching the hem rise and fall. Something about it made me feel less like a haggard patient and more like the kind of woman who went to cocktail parties dripping with perfume and family money.

Over the next few months, I made it my mission to build a new wardrobe from scratch. The process demanded every moment of my free time, every spare thought

We both knew it was impractical. The clothes were expensive and high maintenance, most of them over-the-top fancy for my modest life in nonprofit communications.

But they felt vital. I told myself I was overdue for some frivolity, that I deserved to treat myself.

For my next doctor’s appointment, I picked out a Valentino pencil skirt that fit snugly against my new, withered body.

I hurled the clothes into boxes and garbage bags. They smelled like the hospital, all burned coffee and antiseptic. I didn’t want them. I didn’t even want to look at them. I wanted silk. I wanted velvet.

“Can I see you again in six weeks? We can repeat blood work then and come up with a timeline for scans. Does that sound like an OK plan?”

“Just that I live here,” I said, gesturing at my body. “I have to live here.”

That night I ran my fingers through my hair, and a clump of blond strands fell loose into my palm. “It’s just stress,” I told my cat. I brushed my hands together, letting my hair fall into the trash, and returned to my shopping list.

Each one had lived a life before me. Now I held onto them in the dim light of my bedroom like tangible hope.

We’re forced to find hope in what we used to mock: God, the afterlife, miracles, hemp oil. Healing, by any means. Healing, against all odds.

After every appointment, after every failed attempt to name my illness, I would prop myself in bed, choose new dresses and think of all the places I would wear them.

The clothes promised me something the doctors, as they continue to search for a diagnosis, still can’t: an uncomplicated future. And I promised a future to the clothes.

This was their life after life. And they deserved that, didn’t they?

But these latest shifts challenge key infection control assumptions that go back a century, putting a lot of what went wrong last year in context

They may also signal one of the most important advancements in public health during this pandemic.

If the importance of aerosol transmission had been accepted early, we would have been told from the beginning that it was much safer outdoors, where these small particles disperse more easily, as long as you avoid close, prolonged contact with others.

We would have tried to make sure indoor spaces were well ventilated, with air filtered as necessary.

Instead of blanket rules on gatherings, we would have targeted conditions that can produce superspreading events: people in poorly ventilated indoor spaces, especially if engaged over time in activities that increase aerosol production, like shouting and singing

We would have started using masks more quickly, and we would have paid more attention to their fit, too. And we would have been less obsessed with cleaning surfaces.

The implications of this were illustrated when I visited New York City in late April — my first trip there in more than a year.

A giant digital billboard greeted me at Times Square, with the message “Protecting yourself and others from Covid-19. Guidance from the World Health Organization.”

That billboard neglected the clearest epidemiological pattern of this pandemic: The vast majority of transmission has been indoors, sometimes beyond a range of three or even six feet. The superspreading events that play a major role in driving the pandemic occur overwhelmingly, if not exclusively, indoors.

The billboard had not a word about ventilation, nothing about opening windows or moving activities outdoors, where transmission has been rare and usually only during prolonged and close contact. (Ireland recently reported 0.1 percent of Covid-19 cases were traced to outdoor transmission.)

Mary-Louise McLaws, an epidemiologist at the University of New South Wales in Sydney, Australia, and a member of the W.H.O. committees that craft infection prevention and control guidance, wanted all this examined but knew the stakes made it harder to overcome the resistance. She told The Times last year, “If we started revisiting airflow, we would have to be prepared to change a lot of what we do.” She said it was a very good idea, but she added, “It will cause an enormous shudder through the infection control society.”

In contrast, if the aerosols had been considered a major form of transmission, in addition to distancing and masks, advice would have centered on ventilation and airflow, as well as time spent indoors. Small particles can accumulate in enclosed spaces, since they can remain suspended in the air and travel along air currents. This means that indoors, three or even six feet, while helpful, is not completely protective, especially over time.

To see this misunderstanding in action, look at what’s still happening throughout the world. In India, where hospitals have run out of supplemental oxygen and people are dying in the streets, money is being spent on fleets of drones to spray anti-coronavirus disinfectant in outdoor spaces. Parks, beaches and outdoor areas keep getting closed around the world. This year and last, organizers canceled outdoor events for the National Cherry Blossom Festival in Washington, D.C. Cambodian customs officials advised spraying disinfectant outside vehicles imported from India. The examples are many.

Meanwhile, many countries allowed their indoor workplaces to open but with inadequate aerosol protections. There was no attention to ventilation, installing air filters as necessary or even opening windows when possible, more to having people just distancing three or six feet, sometimes not requiring masks beyond that distance, or spending money on hard plastic barriers, which may be useless at best

clear evidence doesn’t easily overturn tradition or overcome entrenched feelings and egos. John Snow, often credited as the first scientific epidemiologist, showed that a contaminated well was responsible for a 1854 London cholera epidemic by removing the suspected pump’s handle and documenting how the cases plummeted afterward. Many other scientists and officials wouldn’t believe him for 12 years, when the link to a water source showed up again and became harder to deny.

Along the way to modern public health shaped largely by the fight over germs, a theory of transmission promoted by the influential public health figure Charles Chapin took hold

Dr. Chapin asserted in the early 1900s that respiratory diseases were most likely spread at close range by people touching bodily fluids or ejecting respiratory droplets, and did not allow for the possibility that such close-range infection could occur by inhaling small floating particles others emitted

He was also concerned that belief in airborne transmission, which he associated with miasma theories, would make people feel helpless and drop their guard against contact transmission. This was a mistake that would haunt infection control for the next century and more.

It was in this context in early 2020 that the W.H.O. and the C.D.C. asserted that SARS-CoV-2 was transmitted primarily via these heavier, short-range droplets, and provided guidance accordingly

Amid the growing evidence, in July, hundreds of scientists signed an open letter urging the public health agencies, especially the W.H.O., to address airborne transmission of the coronavirus.

Last October, the C.D.C. published updated guidance acknowledging airborne transmission, but as a secondary route under some circumstances, until it acknowledged airborne transmission as crucial on Friday. And the W.H.O. kept inching forward in its public statements, most recently a week ago.

Linsey Marr, a professor of engineering at Virginia Tech who made important contributions to our understanding of airborne virus transmission before the pandemic, pointed to two key scientific errors — rooted in a lot of history — that explain the resistance, and also opened a fascinating sociological window into how science can get it wrong and why.

Dr. Marr said that if you inhale a particle from the air, it’s an aerosol.

biomechanically, she said, nasal transmission faces obstacles, since nostrils point downward and the physics of particles that large makes it difficult for them to move up the nose. And in lab measurements, people emit far more of the easier-to-inhale aerosols than the droplets, she said, and even the smallest particles can be virus laden, sometimes more so than the larger ones, seemingly because of how and where they are produced in the respiratory tract.

Second, she said, proximity is conducive to transmission of aerosols as well because aerosols are more concentrated near the person emitting them. In a twist of history, modern scientists have been acting like those who equated stinky air with disease, by equating close contact, a measure of distance, only with the larger droplets, a mechanism of transmission, without examination.

Since aerosols also infect at close range, measures to prevent droplet transmission — masks and distancing — can help dampen transmission for airborne diseases as well. However, this oversight led medical people to circularly assume that if such measures worked at all, droplets must have played a big role in their transmission.

Another dynamic we’ve seen is something that is not unheard-of in the history of science: setting a higher standard of proof for theories that challenge conventional wisdom than for those that support it.

Another key problem is that, understandably, we find it harder to walk things back. It is easier to keep adding exceptions and justifications to a belief than to admit that a challenger has a better explanation.

The ancients believed that all celestial objects revolved around the earth in circular orbits. When it became clear that the observed behavior of the celestial objects did not fit this assumption, those astronomers produced ever-more-complex charts by adding epicycles — intersecting arcs and circles — to fit the heavens to their beliefs.

In a contemporary example of this attitude, the initial public health report on the Mount Vernon choir case said that it may have been caused by people “sitting close to one another, sharing snacks and stacking chairs at the end of the practice,” even though almost 90 percent of the people there developed symptoms of Covid-19

So much of what we have done throughout the pandemic — the excessive hygiene theater and the failure to integrate ventilation and filters into our basic advice — has greatly hampered our response.

Some of it, like the way we underused or even shut down outdoor space, isn’t that different from the 19th-century Londoners who flushed the source of their foul air into the Thames and made the cholera epidemic worse.

Righting this ship cannot be a quiet process — updating a web page here, saying the right thing there. The proclamations that we now know are wrong were so persistent and so loud for so long.

the progress we’ve made might lead to an overhaul in our understanding of many other transmissible respiratory diseases that take a terrible toll around the world each year and could easily cause other pandemics.

So big proclamations require probably even bigger proclamations to correct, or the information void, unnecessary fears and misinformation will persist, damaging the W.H.O. now and in the future.

I’ve seen our paper used in India to try to reason through aerosol transmission and the necessary mitigations. I’ve heard of people in India closing their windows after hearing that the virus is airborne, likely because they were not being told how to respond

The W.H.O. needs to address these fears and concerns, treating it as a matter of profound change, so other public health agencies and governments, as well as ordinary people, can better adjust.

It needs to begin a campaign proportional to the importance of all this, announcing, “We’ve learned more, and here’s what’s changed, and here’s how we can make sure everyone understands how important this is.” That’s what credible leadership looks like. Otherwise, if a web page is updated in the forest without the requisite fanfare, how will it matter?

The quality of mathematics research in the United States today is the envy of the scientific world. This is a direct result of the openness and inclusivity of the profession.

Can Americans maintain this unmatched excellence in the future? There are worrisome signs that suggest not.

The Organization for Economic Cooperation and Development compares mathematical proficiency among 15-year-olds by country worldwide. According to its 2018 report, America ranked 37th while China, America’s main competitor for world leadership, came in first.

This is despite the fact that the United States is the fifth-highest spender per pupil among the 37 developed OECD nations

This massive failure of our K-12 education system trickles through the STEM pipeline.

At the undergraduate level, too few American students are prepared for higher-level mathematics courses. These students are then unprepared for rigorous graduate-level work

According to our own experiences at the universities where we teach, an overwhelming majority of American students with strong math backgrounds are either foreign-born or first-generation students who have additional support from their education-conscious families. At all levels, STEM disciplines are more and more dependent on a constant flow of foreign talent.

There are many reasons for this failure, but the way that we educate and prepare teachers is particularly influential. The vast majority of K-12 math teachers are graduates of teacher-preparation programs that teach very little substantive mathematics

This has led to a constant stream of ill-advised and dumbed-down reforms. One of the latest fads is anti-racist mathematics. Promoted in several states, the bizarre doctrine threatens to further degrade the teaching of mathematics.

Another major concern is the twisted interpretation of diversity, equity, and inclusion (DEI).

Under the banner of DEI, universities are abandoning the use of standardized tests like the SAT and GRE in admissions, and cities are considering scrapping academic tracking and various gifted programs in schools, which they deem “inequitable.”

such programs are particularly effective, when properly implemented, at discovering and encouraging talented children from disadvantaged backgrounds.

The new 2021 Mathematics Framework, currently under consideration by California’s Department of Education, does away “with all tracking, acceleration, gifted programs, or any instruction that involves clustering by individual differences, without expressing any awareness of the impact these drastic alterations would have in preparing STEM-ready candidates.”

These measures will not only hinder the progress of the generations of our future STEM workforce but also contribute to structural inequalities, as they are uniquely detrimental to students whose parents cannot send them to private schools or effective enrichment programs.

These are just a few examples of an unprecedented fervor for revolutionary change in the name of Critical Race Theory (CRT), a doctrine that views the world as a fierce battleground for the narratives of various identity groups.

This will only lead to a further widening of racial disparities in educational outcomes while lowering American children’s rankings in education internationally.

Ill-conceived DEI policies, often informed by CRT, and the declining standards of K-12 math education feed each other in a vicious circle

Regarding minorities, in particular, public K-12 education all too often produces students unprepared to compete, thus leading to large disparities in admissions at universities, graduate programs, and faculty positions. This disparity is then condemned as a manifestation of structural racism, resulting in administrative measures to lower the evaluation criteria. Lowering standards at all levels leads eventually to even worse outcomes and larger disparities, and so on in a downward spiral.

A case in point is the recent report by the American Mathematical Society that accuses the entire mathematics community, with the thinnest of specific evidence, of systemic racial discrimination. A major justification put forward for such a grave accusation is the lack of sufficient representation of Black mathematicians in the professio

the report, while raising awareness of several ugly facts from the long-ago past, makes little effort to address the real reasons for this, mainly the catastrophic failure of the K-12 mathematical educational system.

The National Science Foundation, a federal institution meant to support fundamental research, is now diverting some of its limited funding to various DEI initiatives of questionable benefit.

Meanwhile, other countries, especially China, are doing precisely the opposite, following the model of our past dedication to objective measures of excellence. How long before we will see a reverse exodus, away from the United States?

The present crisis can still be reversed by focusing on a few concrete actions:

Improve schools in urban areas and inner-city neighborhoods by following the most promising education programs. These programs demonstrate that inner-city children benefit if they are challenged by high standards and a nurturing environment.

Follow the lead of other highly successful rigorous programs such as BASIS schools and Math for America, which focus on rigorous STEM curricula, combined with 21st-century teaching methods, and recruit talented teachers to help them build on their STEM knowledge and teaching methods.

Increase, rather than eliminate, tailored instruction, both for accelerated and remedial math courses.

Reject the soft bigotry of low expectations, that Black children cannot do well in competitive mathematics programs and need dumbed-down ethnocentric versions of mathematics.

Uphold the objective selection process based on merit at all levels of education and research.

It’s what they use to track prey and avoid predation.

The theory of mind is so obvious it’s nearly invisible: it tells us that behavior is the result of the joint operation of pairs of beliefs and desires.

The desires are about the ways we want things to turn out in the future. The beliefs are about the way things are now.

The theory of mind turns what people do into a story with a plot by pairing up the content of beliefs and desires, what they are about.

Psycholinguistics has shown that the theory of mind is necessary for learning language and almost anything else our parents teach us.

Imitating others requires using the theory to figure out what they want us to do and in what order. Without it, you can’t learn much beyond what other higher primates can.

The theory of mind makes us construct stories obsessively, and thus encourages us to see the past as a set of them.

When popular historians seek to know why Hitler declared war on the U.S. (when he didn’t have to), they put the theory of mind to work: What did he believe and what was it that he wanted that made him do such a foolish thing?

he trouble is that the theory of mind is completely wrong about the way the mind, i.e. the brain, actually works. We can’t help but use it to guess what is going on in other people’s minds, and historians rely on it, but the evidence from neuroscience shows that in fact what’s “going on” in anyone’s mind is not decision about what to do in the light of beliefs and desire, but rather a series of neural circuitry firings.

The wrongness of the theory of mind is so profound it makes false all the stories we know and love, in narrative history (and in historical novels).

Neuroscience reveals that the brain is not organized even remotely to work the way the theory of mind says it does. The fact that narrative histories give persistently different answers to questions historians have been asking for centuries should be evidence that storytelling is not where the real answers can be found.

Crucially, they discovered that while different parts of the brain control different things, the neurons’ electrical signals don’t differ in “content”; they are not about different subjects. They are not about anything at all. Each neuron is just in a different part of the mid-brain, doing its job in exactly the same way all other neurons do, sending the same electrochemical oscillations.