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scientists have found they can measure the amount that a person enjoys something by taking MRIs of activation levels in the ventral striatum—the “reward center” nestled in the bullseye of the brain. The ventral striata of teens, in particular, tend to light up especially brightly in response to all kinds of rewards

teens brains are so sensitive to these little jolts of pleasure—or lack thereof—late adolescence is also when depression peaks for many people.

the researchers followed a group of 39 teenagers over the course of one year to see whether the way their brains reacted to either eudaimonic or hedonic rewards correlated with how depressed they felt over time.

the teens who had the greatest brain response to the generous, family-donation financial decision had the greatest declines in depressive symptoms over time. And those who got a boost from the risk-taking game were more likely to have an increase in depression. The types of rewards the teens responded to, it seems, changed their behavior in ways that altered their overall well-being.

It’s important to note that this doesn’t necessarily mean parents can inoculate their teens against depression by forcing them to seek happiness through volunteering. But it could be that teens who already do that kind of thing because it really does lift their spirits are likely to have that lift stick with them.

“Taken together, our findings suggest that well-being may depend on attending to higher values related to family, culture, and morality, rather than to immediate, selfish pleasure,”

Huck is a thirteen (or thereabouts)-year-old boy. He is, in other words, a teenager. What’s more, he is a teenager from the antebellum South. Add to that the disparity between his social standing and education and Tom Sawyer’s, and you get a picture of someone who is quite different from a righteous fifty-something (or even thirty-something) literary critic who is writing in the twentieth century for a literary audience. And that someone has to be judged appropriately for his age, background, and social context—and his creator, evaluated accordingly.

There are a few important issues at play. Huck is not an adult. Tom Sawyer is not a stranger. The South is not a psychology lab. And slavery is not a bunch of lines projected on a screen. Each one of these factors on its own is enough to complicate the situation immensely—and together, they create one big complicated mess, that makes it increasingly likely that Huck will act just as he does, by conforming to Tom’s wishes and reverting to their old group dynamic.

Tom is a part of Huck’s past, and there is nothing like context to cue us back to past habitual behavior in a matter of minutes. (That’s one of the reasons, incidentally, that drug addicts often revert back to old habits when back in old environments.)

Jim is an adult—and an adult who has become a whole lot like a parent to Huck throughout their adventures, protecting him and taking care of him (and later, of Tom as well) much as a parent would. And the behavior that he wants from Huck, when he wants anything at all, is prosocial in the extreme (an apology, to take the most famous example, for playing a trick on him in the fog; not much of an ask, it seems, unless you stop to consider that it’s a slave asking a white boy to acknowledge that he was in the wrong). Tom, on the other hand, is a peer. And his demands are far closer to the anti-social side of the scale. Is it so surprising, then, that Huck sides with his old mate?

Another crucial caveat to Huck’s apparent metamorphosis: we tend to behave differently in private versus public spheres.

behavior is highly contextual—especially when it comes to behaviors that may not be as socially acceptable as one might hope. Huck and Jim’s raft is akin to a private sphere. It is just them, alone on the river, social context flowing away. And when does Huck’s behavior start to shift? The moment that he returns to a social environment, when he joins the Grangerfords in their family feud.

When the researchers looked at conformity to parents, they found a steady decrease in conforming behavior. Indeed, for the majority of measures, peer and parental conformity were negatively correlated. And what’s more, the sharpest decline was in conformity to pro-social behaviors.

On the raft, Jim was in a new environment, where old rules need not apply—especially given its private nature. But how quickly old ways kick back in, irrespective of whether you were a Huck or a Jim in that prior context.

there is a chasm, she points out, between Huck’s stated affection for Jim and his willingness to then act on it, especially in these final episodes. She blames the divide on Twain’s racism. But wouldn’t it be more correct to blame Huck’s only too real humanity?

Twain doesn’t make Huck a hero. He makes him real. Can we blame the book for telling it like it is?

“Many other studies have shown an association between obesity and an increased risk of dementia. These findings demonstrate the complexity of research into risk factors for dementia and it is important to note that BMI is a crude measure – not necessarily an indicator of health. It’s also not clear whether other factors could have affected these results.”

The best protection against dementia, he added, is “eating a healthy, balanced diet, exercising regularly, not smoking, and keeping blood pressure in check”.

But although it is always tempting to use hard science to explain otherwise perplexing behaviour, neuroimaging research is still in its infancy

There is much about the brain that no one understands yet, and there is rarely a clear relationship between a particular brain region and a discrete function, so any links between brain structure and behaviour remain speculative. Indeed, while researchers often take care to show that the relationship between how a brain looks and how someone behaves is correlative, often this link is misinterpreted as a sign of causation

Scientists also point out that brain science cannot be understood in a vacuum. All behaviour is a function of many influences, including parenting, socioeconomic status, nutrition, culture and so on

I liked the joy my students found when they actually earned a grade they’d been reaching for. But whereas I once thought we needed to contain grades, I now see that we may as well let them float skyward. If grade inflation is bad, fighting it is worse. Our goal should be ending the centrality of grades altogether. For years, I feared that a world of only A’s would mean the end of meaningful grades; today, I’m certain of it. But what’s so bad about that?

It’s easy to see why schools want to fight grade inflation. Grades should motivate certain students: those afraid of the stigma of a bad grade or those ambitious, by temperament or conditioning, to succeed in measurable ways. Periodic grading during a term, on quizzes, tests or papers, provides feedback to students, which should enable them to do better. And grades theoretically signal to others, such as potential employers or graduate schools, how well the student did. (Grade-point averages are also used for prizes and class rankings, though that doesn’t strike me as an important feature.)

But it’s not clear that grades work well as motivators. Although recent research on the effects of grades is limited, several studies in the 1970s, 1980s and 1990s measured how students related to a task or a class when it was graded compared to when it was ungraded. Overall, graded students are less interested in the topic at hand and — and, for obvious, common-sense reasons — more inclined to pick the easiest possible task when given the chance. In the words of progressive-education theorist Alfie Kohn, author of “The Homework Myth,” “the quality of learning declines” when grades are introduced, becoming “shallower and more superficial when the point is to get a grade.”

Even where grades can be useful, as in describing what material a student has mastered, they are remarkably crude instruments. Yes, the student who gets a 100 on a calculus exam probably grasps the material better than the student with a 60 — but only if she retains the knowledge, which grades can’t show.

I still can’t say very well what separates a B from an A. What’s more, I never see the kind of incompetence or impudence that would merit a D or an F. And now, in our grade-inflated world, it’s even harder to use grades to motivate, or give feedback, or send a signal to future employers or graduate schools.

According to a 2012 study by the Chronicle of Higher Education, GPA was seventh out of eight factors employers considered in hiring, behind internships, extracurricular activities and previous employment. Last year, Stanford’s registrar told the Chronicle about “a clamor” from employers “for something more meaningful” than the traditional transcript. The Lumina Foundation gave a$1.27 million grant to two organizations for college administrators working to develop better student records, with grades only one part of a student’s final profile.

Some graduate schools, too, have basically ditched grades. “As long as you don’t bomb and flunk out, grades don’t matter very much in M.F.A. programs,” the director of one creative-writing program told the New York Times. To top humanities PhD programs, letters of reference and writing samples matter more than overall GPA (although students are surely expected to have received good grades in their intended areas of study). In fact, it’s impossible to get into good graduate or professional schools without multiple letters of reference, which have come to function as the kind of rich, descriptive comments that could go on transcripts in place of grades.

suggests that GPAs serve not to validate students from elite schools but to keep out those from less-prestigious schools and large public universities, where grades are less inflated. Grades at community colleges “have actually dropped” over the years, according to Stuart Rojstaczer, a co-author of the 2012 grade-inflation study. That means we have two systems: one for students at elite schools, who get jobs based on references, prestige and connections, and another for students everywhere else, who had better maintain a 3.0. Grades are a tool increasingly deployed against students without prestige.

The trouble is that, while it’s relatively easy for smaller colleges to go grade-free, with their low student-to-teacher ratios, it’s tough for professors at larger schools, who must evaluate more students, more quickly, with fewer resources. And adjuncts teaching five classes for poverty wages can’t write substantial term-end comments, so grades are a necessity if they want to give any feedback at all.

It would mean hiring more teachers and paying them better (which schools should do anyway). And if transcripts become more textured, graduate-school admission offices and employers will have to devote more resources to reading them, and to getting to know applicants through interviews and letters of reference — a salutary trend that is underway already.

When I think about getting rid of grades, I think of happier students, with whom I have more open, democratic relationships. I think about being forced to pay more attention to the quiet ones, since I’ll have to write something truthful about them, too. I’ve begun to wonder if a world without grades may be one of those states of affairs (like open marriages, bicycle lanes and single-payer health care) that Americans resist precisely because they seem too good, suspiciously good. Nothing worth doing is supposed to come easy.

Alfie Kohn, too, sees ideology at work in the grade-inflation panic. “Most of what powers the arguments against grade inflation is a very right-wing idea that excellence consists in beating everyone else around you,” he says. “Even when you have sorted them — even when they get to Harvard! — we have to sort them again.” In other words, we can trust only a system in which there are clear winners and losers.

In 2014, according to the F.B.I., anti-Muslim hate crimes represented 16.3 percent of the total of 1,092 reported offenses. Anti-Semitism still led the way as a motive for hate crimes, at 58.2 percent.

Hate crimes may seem chaotic and unpredictable, a consequence of random neurons that happen to fire in the brains of a few angry young men. But we can explain some of the rise and fall of anti-Muslim hate crimes just based on what people are Googling about Muslims.

If our model is right, Islamophobia and thus anti-Muslim hate crimes are currently higher than at any time since the immediate aftermath of the Sept. 11 attacks.

How can these Google searches track Islamophobia so well? Who searches for “I hate Muslims” anyway?We often think of Google as a source from which we seek information directly, on topics like the weather, who won last night’s game or how to make apple pie. But sometimes we type our uncensored thoughts into Google, without much hope that Google will be able to help us. The search window can serve as a kind of confessional.

It is not just that hatred against Muslims is extremely high today. It’s that it’s exceptional compared with prejudice against every other group in the United States.

“If someone is willing to say ‘I hate them’ or ‘they disgust me,’ we know that those emotions are as good a predictor of behavior as actual intent,” said Susan Fiske, a social psychologist at Princeton

Google searches seem to suffer from selection bias: Instead of asking a random sample of Americans how they feel, you just get information from those who are motivated to search. But this restriction may actually help search data predict hate crimes.

“Google searches answer a different question: What do people excited enough by an issue to comment on it think and believe about it? The answer to this question, just because it is unrepresentative of the public as a whole, may be a better bet to predict hate crimes.”

While the vast majority of Muslim Americans won’t be victims of hate crimes, few escape the “constant sense of fear and paranoia” that they or their loved ones might be next, said Rana Ibrahem

What about the other side of the coin — compassion and understanding? Do they stand a chance against hate?Searches for information about Islam and Muslims did rise after the attacks in Paris and San Bernardino. Yet they rose far less than searches for hate did. “Who is Muhammad?” “what do Muslims believe?” and “what does the Quran say?” for instance, were no match for intolerance.

Google searches expressing moods, rather than looking for information, represent a tiny sample of everyone who is actually thinking those thoughts.

The search data also tells us that changes in Americans’ policy concerns have been dramatic. They happened, quite literally, within minutes of the terror attacks.Before the Paris attacks, 60 percent of Americans’ searches that took an obvious view of Syrian refugees saw them positively, asking how they could “help,” “volunteer” or “aid.” The other 40 percent were negative and mostly expressed skepticism about security. After Paris, however, the share of people opposed to refugees rose to 80 percent.

One idea might be to increase cultural integration. This is based on the “contact hypothesis”: If more Americans have Muslim neighbors, they will learn not to harbor irrational hate. We did not find support for this in the data — in fact, we found evidence for the opposite.

That’s evidence for the dominance of the “racial threat” hypothesis, which predicts that proximity breeds tension, not trust.

Another solution might be for leaders to talk about the importance of tolerance and the irrationality of hatred, as President Obama did in his Oval Office speech last Sunday night. He asked Americans to reject discrimination and religious tests for immigration. The reactions to his speech offer an excellent opportunity to see what works and what doesn’t work.

There was one line, however, that did trigger the type of response Mr. Obama might have wanted. He said, “Muslim Americans are our friends and our neighbors, our co-workers, our sports heroes and yes, they are our men and women in uniform, who are willing to die in defense of our country.”After this line, for the first time in more than a year, the top Googled noun after “Muslim” was not “terrorists,” “extremists” or “refugees.” It was “athletes,” followed by “soldiers.” And, in fact, “athletes” kept the top spot for a full day afterward.

On the whole, though, the response to the president’s speech shows that appealing to the better angels of an angry mob will most likely just backfire.

ranslates to increases in academic performance

rating themselves on a "humble-ometer," people generally did not see themselves as others see them

other team members gave better evaluations to those they viewed as humble

Then they took tests -- first individually, then with fellow group members, who gave feedback on each member's work. Students earned credit for individual and group performances

They measured "intellectual humility," based on such traits as "open to criticism" and "knows what he/she is not good at." They also measured "intellectual arrogance," based on such traits as "is close-minded" and "believes own ideas superior to others' ideas.

Additional traits also were evaluated, among them assertiveness, intelligence, self-discipline, openness and sense of humor

intellectually arrogant whom they saw as being high in dominance, extraversion and wanting to be the center of attention, but low in agreeableness and conscientiousness

But it's more challenging for groups to recognize what behavior reveals another person's humility, as opposed to simply being shy or unsure

Learning something new requires first acknowledging your own ignorance and being willing to make your ignorance known to others

The trendlines are obvious: Asked the same questions at about the same points in their lives, Americans are, over time, experiencing worse and worse symptoms associated with anxiety and depression.

there’s an interesting recent wrinkle to this trajectory. In a paper published in 2014 in Social Indicators Research, Twenge tracked the results of the Monitoring the Future (MtF) survey, “a nationally representative sample of U.S. 12th graders [administered] every year since 1976,” between 1982 and 2013. Like the MMPI, the MtF asks students about symptoms in a manner that should be generally resistant to cultural change: The somatic items Twenge examined asked about trouble sleeping, remembering things, thinking/concentrating, and learning, as well as shortness of breath. An interesting recent pattern emerged on these measures:

All the items end up significantly higher than where they started, but for many of them most of the increase happens over the first half of the time period in question. From the late 1990s or so until 2013, many of the items bounce around a bit but ultimately remain flat, or flat-ish.

drugs — Prozac and Lexapro, among others — have been prescribed to millions of people who experience these symptoms, many of whom presumably saw some improvement once the drugs kicked in, so this explanation at least makes intuitive sens

there are likely other factors leading to the plateau as well, said Twenge. For one thing, the “crime rate is lower [today] than it was when it peaked in the early 1990s,” and dealing with crime can lead to anxiety and depression symptoms. Other indicators of youth well-being, like teen pregnancy, were also significantly higher back then, and could have accounted for the trajectory visible on the graphs.“For whatever reason,” said Twenge, “if you look at what was going on back then, the early 1990s were not a good time, particularly for young people.”

“Obviously there’s a lot of good things about societal and technological progress,” she said, “and in a lot of ways our lives are much easier than, say, our grandparents’ or great-grandparents’ lives. But there’s a paradox here that we seem to have so much ease and relative economic prosperity compared to previous centuries, yet there’s this dissatisfaction, there’s this unhappiness, there are these mental health issues in terms of depression and anxiety.

She thinks the primary problem is that “modern life doesn’t give us as many opportunities to spend time with people and connect with them, at least in person, compared to, say, 80 years ago or 100 years ago. Families are smaller, the divorce rate is higher, people get married much later in life.”

it may simply be the case that many people who lived in less equal, more “traditional” times were forced into close companionship with a lot of other people, and that this shielded them from certain psychological problems, whatever else was going on in their lives.

She was virtually never alone — and that can be a bad thing, clearly, but from a mental health perspective being surrounded by people is a good thing.”

the shift away from this sort of life has also brought with it a shift in values, and Twenge thinks that this, too, can account for the increase in anxiety and depression. “There’s clear evidence that the focus on money, fame, and image has gone up,

“and there’s also clear evidence that people who focus on money, fame, and image are more likely to be depressed and anxious.”

“It’s so tempting to say the world is going to hell in a handbasket and everything’s bad, but there are so many good things about modern life,” she said. So maybe the key message here is that while there’s no way to go back to family farms and young marriage and parenthood — and, from an equality standpoint,we wouldn’t want to anyway — modern life needs to do a better job of connecting people to one another, and encouraging them to adopt the sorts of goals and outlooks that will make them happy.

Now we have a body of research that makes the connection between stress and addiction definitive. More surprising, it shows that we can change the path to addiction by changing our environment.

Neuroscientists have found that food and recreational drugs have a common target in the “reward circuit” of the brain, and that the brains of humans and other animals who are stressed undergo biological changes that can make them more susceptible to addiction.

In a 2010 study, Diana Martinez and colleagues at Columbia scanned the brains of a group of healthy controls and found that lower social status and a lower degree of perceived social support — both presumed to be proxies for stress — were correlated with fewer dopamine receptors, called D2s, in the brain’s reward circuit

The reward circuit evolved to help us survive by driving us to locate food or sex in our environment

Today, the more D2 receptors you have, the higher your natural level of stimulation and pleasure — and the less likely you are to seek out recreational drugs or comfort food to compensate

people addicted to cocaine, heroin, alcohol and methamphetamines experience a significant reduction in their D2 receptor levels that persists long after drug use has stopped. These people are far less sensitive to rewards, are less motivated and may find the world dull, once again making them prone to seek a chemical means to enhance their everyday life.

the myth has persisted that addiction is either a moral failure or a hard-wired behavior — that addicts are either completely in command or literally out of their minds

The processed food industry has transformed our food into a quasi-drug, while the drug industry has synthesized ever more powerful drugs that have been diverted for recreational use.

At this point you may be wondering: What controls the reward circuit in the first place? Some of it is genetic. We know that certain gene variations elevate the risk of addiction to various drugs. But studies of monkeys suggest that our environment can trump genetics and rewire the brain.

simply by changing the environment, you can increase or decrease the likelihood of an animal becoming a drug addict.

The same appears true for humans. Even people who are not hard-wired for addiction can be made dependent on drugs if they are stressed

Is it any wonder, then, that the economically frightening situation that so many Americans experience could make them into addicts? You will literally have a different brain depending on your ZIP code, social circumstances and stress level.

In 1990, no state in our country had an adult obesity rate above 15 percent; by 2015, 44 states had obesity rates of 25 percent or higher. What changed?

What happened is that cheap, calorie-dense foods that are highly rewarding to your brain are now ubiquitous.

Nothing in our evolution has prepared us for the double whammy of caloric modern food and potent recreational drugs. Their power to activate our reward circuit, rewire our brain and nudge us in the direction of compulsive consumption is unprecedented.

Food, like drugs, stimulates the brain’s reward circuit. Chronic exposure to high-fat and sugary foods is similarly linked with lower D2 levels, and people with lower D2 levels are also more likely to crave such foods. It’s a vicious cycle in which more exposure begets more craving.

Fortunately, our brains are remarkably plastic and sensitive to experience. Although it’s far easier said than done, just limiting exposure to high-calorie foods and recreational drugs would naturally reset our brains to find pleasure in healthier foods and life without drugs.

t is true that race is a social construct. It is also true, as Dr. Lewontin wrote, that human populations “are remarkably similar to each other” from a genetic point of view.

this consensus has morphed, seemingly without questioning, into an orthodoxy. The orthodoxy maintains that the average genetic differences among people grouped according to today’s racial terms are so trivial when it comes to any meaningful biological traits that those differences can be ignored.

With the help of these tools, we are learning that while race may be a social construct, differences in genetic ancestry that happen to correlate to many of today’s racial constructs are real.

I have deep sympathy for the concern that genetic discoveries could be misused to justify racism. But as a geneticist I also know that it is simply no longer possible to ignore average genetic differences among “races.”

Groundbreaking advances in DNA sequencing technology have been made over the last two decades

Care.

The orthodoxy goes further, holding that we should be anxious about any research into genetic differences among populations

You will sometimes hear that any biological differences among populations are likely to be small, because humans have diverged too recently from common ancestors for substantial differences to have arisen under the pressure of natural selection. This is not true. The ancestors of East Asians, Europeans, West Africans and Australians were, until recently, almost completely isolated from one another for 40,000 years or longer, which is more than sufficient time for the forces of evolution to work

I am worried that well-meaning people who deny the possibility of substantial biological differences among human populations are digging themselves into an indefensible position, one that will not survive the onslaught of science.

I am also worried that whatever discoveries are made — and we truly have no idea yet what they will be — will be cited as “scientific proof” that racist prejudices and agendas have been correct all along, and that those well-meaning people will not understand the science well enough to push back against these claims.

This is why it is important, even urgent, that we develop a candid and scientifically up-to-date way of discussing any such difference

While most people will agree that finding a genetic explanation for an elevated rate of disease is important, they often draw the line there. Finding genetic influences on a propensity for disease is one thing, they argue, but looking for such influences on behavior and cognition is another

Is performance on an intelligence test or the number of years of school a person attends shaped by the way a person is brought up? Of course. But does it measure something having to do with some aspect of behavior or cognition? Almost certainly.

Recent genetic studies have demonstrated differences across populations not just in the genetic determinants of simple traits such as skin color, but also in more complex traits like bodily dimensions and susceptibility to diseases.

in Iceland, there has been measurable genetic selection against the genetic variations that predict more years of education in that population just within the last century.

consider what kinds of voices are filling the void that our silence is creating

Nicholas Wade, a longtime science journalist for The New York Times, rightly notes in his 2014 book, “A Troublesome Inheritance: Genes, Race and Human History,” that modern research is challenging our thinking about the nature of human population differences. But he goes on to make the unfounded and irresponsible claim that this research is suggesting that genetic factors explain traditional stereotypes.

139 geneticists (including myself) pointed out in a letter to The New York Times about Mr. Wade’s book, there is no genetic evidence to back up any of the racist stereotypes he promotes.

Another high-profile example is James Watson, the scientist who in 1953 co-discovered the structure of DNA, and who was forced to retire as head of the Cold Spring Harbor Laboratories in 2007 after he stated in an interview — without any scientific evidence — that research has suggested that genetic factors contribute to lower intelligence in Africans than in Europeans.

What makes Dr. Watson’s and Mr. Wade’s statements so insidious is that they start with the accurate observation that many academics are implausibly denying the possibility of average genetic differences among human populations, and then end with a claim — backed by no evidence — that they know what those differences are and that they correspond to racist stereotypes

They use the reluctance of the academic community to openly discuss these fraught issues to provide rhetorical cover for hateful ideas and old racist canards.

This is why knowledgeable scientists must speak out. If we abstain from laying out a rational framework for discussing differences among populations, we risk losing the trust of the public and we actively contribute to the distrust of expertise that is now so prevalent.

If scientists can be confident of anything, it is that whatever we currently believe about the genetic nature of differences among populations is most likely wrong.

For example, my laboratory discovered in 2016, based on our sequencing of ancient human genomes, that “whites” are not derived from a population that existed from time immemorial, as some people believe. Instead, “whites” represent a mixture of four ancient populations that lived 10,000 years ago and were each as different from one another as Europeans and East Asians are today.

For me, a natural response to the challenge is to learn from the example of the biological differences that exist between males and females

The differences between the sexes are far more profound than those that exist among human populations, reflecting more than 100 million years of evolution and adaptation. Males and females differ by huge tracts of genetic material

How do we accommodate the biological differences between men and women? I think the answer is obvious: We should both recognize that genetic differences between males and females exist and we should accord each sex the same freedoms and opportunities regardless of those differences

fulfilling these aspirations in practice is a challenge. Yet conceptually it is straightforward.

Compared with the enormous differences that exist among individuals, differences among populations are on average many times smaller, so it should be only a modest challenge to accommodate a reality in which the average genetic contributions to human traits differ.

health may be the instigator of mood

The latest entry in the health and happiness field

appears to poke a hole in the accepted dictum that well-being is a driver of good health

Small studies have hinted at causality by demonstrating that interventions to increase positive feelings yield improved physiological measurements

If a patient has poor health and is also feeling miserable, it’s not enough just to address the medical problem.

But the opposite may offer an even more powerful payoff. When doctors notice unhappiness in their patients, they should be probing more carefully for hidden illness

I also inquire about obstacles to their happiness, and brainstorm with them on ways to ease some of these

The side effect profile and cost surely beat most of our current medications, and, at least for now, you don’t have to get prior authorization from an insurance company.

McClintock found that outside of ailing tycoons and Donald Trump, in the practical world it basically doesn’t exist. Where it does, it doesn’t last. The dominant force in mating is matching.

What appears to be an exchange of beauty for socioeconomic status is often actually not an exchange, McClintock wrote, but a series of matched virtues

Economically successful women partner with economically successful men, and physically attractive women partner with physically attractive men.

Because people of high socioeconomic status are, on average, rated as more physically attractive than people of lower status, many correlations between one partner's appearance and the other partner's status are spurious and misconstrued.

“Women spend a lot more time trying to look good than men do,” McClintock said. “That creates a lot of mess in this data. If you don’t take that into account then you actually see there’s a lot of these guys who are partnered with women who are better looking than them, which is just because, on average, women are better looking. Men are partnering 'up' in attractiveness.

And men earn more than women—we’ve got that 70-percent wage gap—so women marry 'up' in income. You’ve got to take these things into account before concluding that women are trading beauty for money.”

“It would be very hard to separate out class and attractiveness,” McClintock said, “because they’re just so fundamentally linked. I can’t control for that—but I don’t see how anybody could.”

“Controlling for both partners’ physical attractiveness may not eliminate the relationship between female beauty and male status,” McClintock wrote, “but it should at least reduce this relationship substantially.”

provided by democracy are able to constrain governments’ desire to manipulate information or, more specifically, their desire to exaggerate how well the economy is doing,

"The way I try to answer the question above is by comparing GDP (a self-reported indicator, prone to manipulation) and nighttime lights (recorded by satellites from outer space and much harder to manipulate) as measures of economic activity."

"Consumption of nearly all goods in the evening requires lights," that paper explained. "As income rises, so does light usage per person, in both consumption activities and many investment activities."

As a result, increases in nighttime lighting generally track with increases in GDP

Martinez sorted the world's countries by their Freedom House score, which classifies countries on a spectrum ranging from "free" to "not free," based on categories such as civil rights protections and civil liberties. He then looked at how changes in nighttime lighting correlated with the countries' self-reported GDP measures.

"I find that a 10 percent increase in nighttime lights is associated with a 2.4 percent increase in GDP in the most democratic countries and with a 2.9 percent to 3.4 percent increase in GDP in the most authoritarian ones," Martinez said. The most obvious explanation is that those countries are the most likely to fudge their GDP figures to make their political leaders look good.

Beyond that, he found that authoritarian countries previously ruled by communist governments were particularly likely to report high GDP relative to nighttime lighting, as were authoritarian countries that were coming up on an election year.

an external locus is correlated with worse academic achievement, more stress and higher levels of depression.

this external locus of control has been increasing among students since the 1960s. No surprise here, as young people have been increasingly exposed to trigger warnings, sensitivity about microaggressions and safe spaces.

However, the external locus of control can also be based on an illusion that something affects us — meaning that the resulting unhappiness is unnecessary.

an external locus of control is not necessarily inaccurate. If someone is directly affected by a political action

“This is maya.” He explained that we needlessly attach our fate to external things, bringing misery. The simple solution: Just let go.

Many of us consume political news and commentary in a compulsive, concupiscent sort of way, voluntarily subjecting ourselves to gratuitous information and stimuli, particularly on social media.

find a way to bring politics more into your sphere of influence so it no longer qualifies as an external locus of contro

nstead, get involved in a tangible way — volunteering, donating money or even running for office. This transforms you from victim of political circumstance to problem solver.

Second, pay less attention to politics as entertainment. Read the news once a day

Taste does not simply equal your taste buds. It draws on information from all our senses as well as context. As a result, food is susceptible to the same trickery as wine. Adding yellow food dye to vanilla pudding leads people to experience a lemony taste. Diners eating in the dark at a chic concept restaurant confuse veal for tuna. Branding, packaging, and price tags are equally important to enjoyment. Cheap fish is routinely passed off as its pricier cousins at seafood and sushi restaurants. 

Just like with wine and classical music, we often judge food based on very different criteria than what we claim. The result is that our perceptions are easily skewed in ways we don’t anticipate. 

What does it mean for wine that presentation so easily trumps the quality imbued by being grown on premium Napa land or years of fruitful aging? Is it comforting that the same phenomenon is found in food and classical music, or is it a strike against the authenticity of our enjoyment of them as well? How common must these manipulations be until we concede that the influence of the price tag of a bottle of wine or the visual appearance of a pianist is not a trick but actually part of the quality?

To answer these questions, we need to investigate the underlying mechanism that leads us to judge wine, food, and music by criteria other than what we claim to value. And that mechanism seems to be the quick, intuitive judgments our minds unconsciously make

this unknowability also makes it easy to be led astray when our intuition makes a mistake. We may often be able to count on the price tag or packaging of food and wine for accurate information about quality. But as we believe that we’re judging based on just the product, we fail to recognize when presentation manipulates our snap judgments.

Participants were just as effective when watching 6 second video clips and when comparing their ratings to ratings of teacher effectiveness as measured by actual student test performance. 

The power of intuitive first impressions has been demonstrated in a variety of other contexts. One experiment found that people predicted the outcome of political elections remarkably well based on silent 10 second video clips of debates - significantly outperforming political pundits and predictions made based on economic indicators.

In a real world case, a number of art experts successfully identified a 6th century Greek statue as a fraud. Although the statue had survived a 14 month investigation by a respected museum that included the probings of a geologist, they instantly recognized something was off. They just couldn’t explain how they knew.

Cases like this represent the canon behind the idea of the “adaptive unconscious,” a concept made famous by journalist Malcolm Gladwell in his book Blink. The basic idea is that we constantly, quickly, and unconsciously do the equivalent of judging a book by its cover. After all, a cover provides a lot of relevant information in a world in which we don’t have time to read every page.

Gladwell describes the adaptive unconscious as “a kind of giant computer that quickly and quietly processes a lot of the data we need in order to keep functioning as human beings.”

In a famous experiment, psychologist Nalini Ambady provided participants in an academic study with 30 second silent video clips of a college professor teaching a class and asked them to rate the effectiveness of the professor.

In follow up experiments, Chia-Jung Tsay found that those judging musicians’ auditions based on visual cues were not giving preference to attractive performers. Rather, they seemed to look for visual signs of relevant characteristics like passion, creativity, and uniqueness. Seeing signs of passion is valuable information. But in differentiating between elite performers, it gives an edge to someone who looks passionate over someone whose play is passionate

Outside of these more eccentric examples, it’s our reliance on quick judgments, and ignorance of their workings, that cause people to act on ugly, unconscious biases

It’s also why - from a business perspective - packaging and presentation is just as important as the good or service on offer. Why marketing is just as important as product. 

Gladwell ends Blink optimistically. By paying closer attention to our powers of rapid cognition, he argues, we can avoid its pitfalls and harness its powers. We can blindly audition musicians behind a screen, look at a piece of art devoid of other context, and pay particular attention to possible unconscious bias in our performance reports.

But Gladwell’s success in demonstrating how the many calculations our adaptive unconscious performs without our awareness undermines his hopeful message of consciously harnessing its power.

As a former world-class tennis player and coach of over 50 years, Braden is a perfect example of the ideas behind thin slicing. But if he can’t figure out what his unconscious is up to when he recognizes double faults, why should anyone else expect to be up to the task?

flawed judgment in fields like medicine and investing has more serious consequences. The fact that expertise is so tricky leads psychologist Daniel Kahneman to assert that most experts should seek the assistance of statistics and algorithms in making decisions.

In his book Thinking, Fast and Slow, he describes our two modes of thought: System 1, like the adaptive unconscious, is our “fast, instinctive, and emotional” intuition. System 2 is our “slower, more deliberative, and more logical” conscious thought. Kahneman believes that we often leave decisions up to System 1 and generally place far “too much confidence in human judgment” due to the pitfalls of our intuition described above.

Not every judgment will be made in a field that is stable and regular enough for an algorithm to help us make judgments or predictions. But in those cases, he notes, “Hundreds of studies have shown that wherever we have sufficient information to build a model, it will perform better than most people.”

Experts can avoid the pitfalls of intuition more easily than laypeople. But they need help too, especially as our collective confidence in expertise leads us to overconfidence in their judgments. 

This article has referred to the influence of price tags and context on products and experiences like wine and classical music concerts as tricks that skew our perception. But maybe we should consider them a real, actual part of the quality.

Losing ourselves in a universe of relativism, however, will lead us to miss out on anything new or unique. Take the example of the song “Hey Ya!” by Outkast. When the music industry heard it, they felt sure it would be a hit. When it premiered on the radio, however, listeners changed the channel. The song sounded too dissimilar from songs people liked, so they responded negatively. 

It took time for people to get familiar with the song and realize that they enjoyed it. Eventually “Hey Ya!” became the hit of the summer.

Many boorish people talking about the ethereal qualities of great wine probably can't even identify cork taint because their impressions are dominated by the price tag and the wine label. But the classic defense of wine - that you need to study it to appreciate it - is also vindicated. The open question - which is both editorial and empiric - is what it means for the industry that constant vigilance and substantial study is needed to dependably appreciate wine for the product quality alone. But the questions is relevant to the enjoyment of many other products and experiences that we enjoy in life.

Maybe the most important conclusion is to not only recognize the fallibility of our judgments and impressions, but to recognize when it matters, and when it doesn’t

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.

It’s because he’s a reactionary fantasist, whose policies stir the emotions but are stalled in the headwinds of reality

These are not conservative reforms, thought-through, possible to implement, strategically planned. They are the unhinged fantasies of a 71-year-old Fox News viewer imagining he can reconstruct the late 1950s. They cannot actually be implemented, without huge damage.

In Britain, meanwhile, Brexit is in exactly the same place — a reactionary policy that is close to impossible to implement without economic and diplomatic catastrophe

Brexit too was built on Trump-like lies, and a Trump-like fantasy that 50 years of integration with the E.U. could be magically abolished overnight, and that the Britain of the early 1970s could be instantly re-conjured. No actual conservative can possibly believe that such radical, sudden change won’t end in tears.

“The researchers start by simulating what happens when extra links are introduced into a social network. Their network consists of men and women from different races who are randomly distributed. In this model, everyone wants to marry a person of the opposite sex but can only marry someone with whom a connection exists. This leads to a society with a relatively low level of interracial marriage. But if the researchers add random links between people from different ethnic groups, the level of interracial marriage changes dramatically.”

the line to draw, it seems to me, is when a speech is actually shut down or rendered impossible by disruption. A fiery protest that initially prevents an event from starting is one thing; a disruption that prevents the speech taking place at all is another.

Maybe a college could set a time limit for protest — say, ten or fifteen minutes — after which the speaker must be heard, or penalties will be imposed. Heckling — that doesn’t prevent a speech — should also be tolerated to a reasonable extent. There’s a balance here that protects everyone’s free speech

dating apps are changing our society, by becoming the second-most common way straights meet partners, and by expanding the range of people we can meet.

here’s what’s intriguing: Correlated with that is a sustained, and hard-to-explain, rise in interracial marriage.

“It is intriguing that shortly after the introduction of the first dating websites in 1995, like Match.com, the percentage of new marriages created by interracial couples increased rapidly,” say the researchers. “The increase became steeper in the 2000s, when online dating became even more popular. Then, in 2014, the proportion of interracial marriages jumped again.” That was when Tinder took off.

Disruptions of events are, to my mind, integral to the exercise of free speech. Hecklers are part of the contentious and messy world of open debate. To suspend or, after three offenses, expel students for merely disrupting events is not so much to chill the possibility of dissent, but to freeze it altogether.

Even more encouraging, the marriages begun online seem to last longer than others.

I wonder if online dating doesn’t just expand your ability to meet more people of another race, by eliminating geography and the subtle grouping effect of race and class and education. Maybe it lowers some of the social inhibitions against interracial dating.

It’s always seemed to me that racism is deeply ingrained in human nature, and always will be, simply because our primate in-group aversion to members of an out-group expresses itself in racism, unless you actively fight it. You can try every law or custom to mitigate this, but it will only go so far.