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“The curriculum covers topics from causal modeling and probability to game theory and cognitive science,” read a website promising teens a summer of Rationalist learning. “How can we understand our own reasoning, behavior, and emotions? How can we think more clearly and better achieve our goals?”

Some lived in group houses. Some practiced polyamory. “They are basically just hippies who talk a lot more about Bayes’ theorem than the original hippies,” said Scott Aaronson, a University of Texas professor who has stayed in one of the group houses.

For Kelsey Piper, who embraced these ideas in high school, around 2010, the movement was about learning “how to do good in a world that changes very rapidly.”

Yes, the community thought about A.I., she said, but it also thought about reducing the price of health care and slowing the spread of disease.

Slate Star Codex, which sprung up in 2013, helped her develop a “calibrated trust” in the medical system. Many people she knew, she said, felt duped by psychiatrists, for example, who they felt weren’t clear about the costs and benefits of certain treatment.

That was not the Rationalist way.

“There is something really appealing about somebody explaining where a lot of those ideas are coming from and what a lot of the questions are,” she said.

Sam Altman, chief executive of OpenAI, an artificial intelligence lab backed by a billion dollars from Microsoft. He was effusive in his praise of the blog.It was, he said, essential reading among “the people inventing the future” in the tech industry.

Mr. Altman, who had risen to prominence as the president of the start-up accelerator Y Combinator, moved on to other subjects before hanging up. But he called back. He wanted to talk about an essay that appeared on the blog in 2014.The essay was a critique of what Mr. Siskind, writing as Scott Alexander, described as “the Blue Tribe.” In his telling, these were the people at the liberal end of the political spectrum whose characteristics included “supporting gay rights” and “getting conspicuously upset about sexists and bigots.”

But as the man behind Slate Star Codex saw it, there was one group the Blue Tribe could not tolerate: anyone who did not agree with the Blue Tribe. “Doesn’t sound quite so noble now, does it?” he wrote.

Mr. Altman thought the essay nailed a big problem: In the face of the “internet mob” that guarded against sexism and racism, entrepreneurs had less room to explore new ideas. Many of their ideas, such as intelligence augmentation and genetic engineering, ran afoul of the Blue Tribe.

Mr. Siskind was not a member of the Blue Tribe. He was not a voice from the conservative Red Tribe (“opposing gay marriage,” “getting conspicuously upset about terrorists and commies”). He identified with something called the Grey Tribe — as did many in Silicon Valley.

The Grey Tribe was characterized by libertarian beliefs, atheism, “vague annoyance that the question of gay rights even comes up,” and “reading lots of blogs,” he wrote. Most significantly, it believed in absolute free speech.

The essay on these tribes, Mr. Altman told me, was an inflection point for Silicon Valley. “It was a moment that people talked about a lot, lot, lot,” he said.

And in some ways, two of the world’s prominent A.I. labs — organizations that are tackling some of the tech industry’s most ambitious and potentially powerful projects — grew out of the Rationalist movement.

In 2005, Peter Thiel, the co-founder of PayPal and an early investor in Facebook, befriended Mr. Yudkowsky and gave money to MIRI. In 2010, at Mr. Thiel’s San Francisco townhouse, Mr. Yudkowsky introduced him to a pair of young researchers named Shane Legg and Demis Hassabis. That fall, with an investment from Mr. Thiel’s firm, the two created an A.I. lab called DeepMind.

Like the Rationalists, they believed that A.I could end up turning against humanity, and because they held this belief, they felt they were among the only ones who were prepared to build it in a safe way.

In 2014, Google bought DeepMind for $650 million. The next year, Elon Musk — who also worried A.I. could destroy the world and met his partner, Grimes, because they shared an interest in a Rationalist thought experiment — founded OpenAI as a DeepMind competitor. Both labs hired from the Rationalist community.

Mr. Aaronson, the University of Texas professor, was turned off by the more rigid and contrarian beliefs of the Rationalists, but he is one of the blog’s biggest champions and deeply admired that it didn’t avoid live-wire topics.

“It must have taken incredible guts for Scott to express his thoughts, misgivings and questions about some major ideological pillars of the modern world so openly, even if protected by a quasi-pseudonym,” he said

In late June of last year, not long after talking to Mr. Altman, the OpenAI chief executive, I approached the writer known as Scott Alexander, hoping to get his views on the Rationalist way and its effect on Silicon Valley. That was when the blog vanished.

The issue, it was clear to me, was that I told him I could not guarantee him the anonymity he’d been writing with. In fact, his real name was easy to find because people had shared it online for years and he had used it on a piece he’d written for a scientific journal. I did a Google search for Scott Alexander and one of the first results I saw in the auto-complete list was Scott Alexander Siskind.

More than 7,500 people signed a petition urging The Times not to publish his name, including many prominent figures in the tech industry. “Putting his full name in The Times,” the petitioners said, “would meaningfully damage public discourse, by discouraging private citizens from sharing their thoughts in blog form.” On the internet, many in Silicon Valley believe, everyone has the right not only to say what they want but to say it anonymously.

I spoke with Manoel Horta Ribeiro, a computer science researcher who explores social networks at the Swiss Federal Institute of Technology in Lausanne. He was worried that Slate Star Codex, like other communities, was allowing extremist views to trickle into the influential tech world. “A community like this gives voice to fringe groups,” he said. “It gives a platform to people who hold more extreme views.”

I assured her my goal was to report on the blog, and the Rationalists, with rigor and fairness. But she felt that discussing both critics and supporters could be unfair. What I needed to do, she said, was somehow prove statistically which side was right.

When I asked Mr. Altman if the conversation on sites like Slate Star Codex could push people toward toxic beliefs, he said he held “some empathy” for these concerns. But, he added, “people need a forum to debate ideas.”

In August, Mr. Siskind restored his old blog posts to the internet. And two weeks ago, he relaunched his blog on Substack, a company with ties to both Andreessen Horowitz and Y Combinator. He gave the blog a new title: Astral Codex Ten. He hinted that Substack paid him $250,000 for a year on the platform. And he indicated the company would give him all the protection he needed.

You can’t have a blood family of 300 million, nor even a large enough one to do things like build an agrarian society

In order to have large cities built on agrarianism it was necessary not only to innovate technology, but to transform our very consciousness as it related to how we defined what a person was, both ourselves and others

Instead of needing to have real, flowing blood with common DNA from birth, it was merely necessary to be among the same abstract family organized under a king of some kind — a kind of stand in for the father or patriarch. We developed law and law enforcement as abstract disembodied voices of the father. This allowed total strangers without any family ties to interact in the same society in a constructive and organized way. Thus: civilization as we know it

Those ancient polities have developed finally into the Nation, a kind of tribe so fully abstracted that you can be of any blood and language and religion and still function within it.

So, too, are all other forms of human separation — and the opposition and conflicts they spawn — illusory in nature. We moved beyond blood, but then it was language or religion or fealty that made it impossible to work together, and we warred over that

we’re told these borders mean everything, that they are real and urgent and demand constant sacrifice to maintain.

why is that border there? Why borders?

We’re stuck in a mode of thinking that’s no longer sensible. There isn’t a reason for borders. There never really was, but now more than ever we have no utility for them, no need for them

What humanity has to do is wake up to the reality of post-tribalism. This means seeing through all these invented borders to the truth that we are all people, we are all fundamentally the same, and we can all learn to live with one another.

It was the idea of necessary conflict based on blood that preceded the fights that appeared to justify the belief in that blood-based conflict.

Nations have saturated the entire globe. There are no more frontiers. It’s all Nations butting up against one another.

We are all people of a similar nature and we do have the option to relate to one another as people for the sake of saving our shared homes and futures. We all hunger and thirst and become lonely, we all laugh and weep in the same language. Stripped of confounding symbols we are undivided.

There are a lot of people upset about the illusion of borders. They want a different reality, one in which there are Good Tribes (their tribe) and Bad Tribes (all the other ones).

but the world is already so mixed together they can’t draw those borders anymore. Hence: fascism.

There are no firm foundations for defining this tribe, however, so he’s left to cobble together some kind of ad hoc notion of in- and out-group. Like a magpie he collects ways of dividing people as appeals to his caprice: race, sex, Nation, etc., but there’s no greater sense to it, so it’s all arbitrary, all a mess.

No amount of magical thinking from conservatives can change the reality of globalism, however; what one Nation does to pollute will affect us all, and that is according to the laws of physics. No political movement can change those physics. We have to adapt or perish.

a key part of it is a simple lack of imagination. He just doesn’t realize there’s an option to not have borders, because his entire consciousness is married to the idea of of-me and not-of-me, Us and Them, and if there is no Them there can’t be an Us, and therefore life stops making sense

What has to be true if there are no tribes? We have no need to discriminate among who we may love. Loving and caring for all people as if they were blood family is the path forward

There needs to be a new story for us to share. It’s not enough to stop believing in the old way of borders, we have to actively seek out a new way of thinking and speaking and living that reflects the world as it is and as it can be.

there are others who have more tangible investments in borders: Those who have grown fat off the conflicts driven by these invented borders don’t want us to see how pointless it all is. These billionaires and presidents and kings want us to keep fighting against one another over the borders they so lazily define because it gives them a means of power and control.

We have to be ready for their opposition, however. They’ll do what they can to force us to act as if their borders are real. We don’t need to listen, though we do need to be ready to sacrifice.

Without a globally-coordinated response we can’t resolve a globally-driven problem such as climate change. If we can grant the humanity of all people we can start to imagine ways of relating to one another that aren’t opposed and antagonistic, but which are cooperative and aimed at harmony.

This transformation of consciousness must happen in our own hearts and minds before it can happen in concert.

the Nation has already been shown to be unnecessary because of social globalism. Pick a major city on earth and you’ll find every kind of person living together in peace! Not perfect peace, but not constant and unavoidable war, and that is what counts.

We can’t keep pretending as if borders matter when we can so clearly see that they don’t, but we can’t just have no story at all, there must be a way of contextualizing a future without borders. I don’t know what that story is, exactly, but I believe it is something like love writ large. Once we’re ready to start telling it we can start living it.

Historically, U.S. officials, often encouraged by public opinion, have wanted Cherokees to adopt U.S. legal and cultural practices. When not attempting to terminate the tribe, U.S. officials have sided with freedmen whenever tribal citizenship disputes reach U.S. courts. U.S. politicians have also repeatedly threatened to withhold federal money should the Cherokee Nation not grant freedmen citizenship.

Colonists, later U.S. citizens, wanted to acquire Cherokee land and to make Cherokees more like whites in terms of their religious, government and economic practices. That meant that Cherokees would have to abandon their practice of holding land communally, which made land difficult for U.S. settlers to acquire because they could not deal with individuals.

After the war, the U.S. forced the Cherokee Nation to sign the Treaty of 1866. The tribe’s 1839 Constitution, affirming previous laws, had stated that Cherokee citizens must be descended from Cherokees, not their Black slaves. But in this peace treaty, Cherokees agreed to make their former slaves full tribal citizens.

The Notre Dame sociologist Christian Smith once summarized the moral narrative told by the American left like this: “Once upon a time, the vast majority” of people suffered in societies that were “unjust, unhealthy, repressive and oppressive.” These societies were “reprehensible because of their deep-rooted inequality, exploitation and irrational traditionalism — all of which made life very unfair, unpleasant and short. But the noble human aspiration for autonomy, equality and prosperity struggled mightily against the forces of misery and oppression and eventually succeeded in establishing modern, liberal, democratic, capitalist, welfare societies.” Despite our progress, “there is much work to be done to dismantle the powerful vestiges of inequality, exploitation and repression.” This struggle, as Smith put it, “is the one mission truly worth dedicating one’s life to achieving.”This is a heroic liberation narrative. For the American left, African-Americans, women and other victimized groups are the sacred objects at the center of the story. As liberals circle around these groups, they bond together and gain a sense of righteous common purpose.

the Reagan narrative like this: “Once upon a time, America was a shining beacon. Then liberals came along and erected an enormous federal bureaucracy that handcuffed the invisible hand of the free market. They subverted our traditional American values and opposed God and faith at every step of the way.” For example, “instead of requiring that people work for a living, they siphoned money from hard-working Americans and gave it to Cadillac-driving drug addicts and welfare queens.” Instead of the “traditional American values of family, fidelity and personal responsibility, they preached promiscuity, premarital sex and the gay lifestyle” and instead of “projecting strength to those who would do evil around the world, they cut military budgets, disrespected our soldiers in uniform and burned our flag.” In response, “Americans decided to take their country back from those who sought to undermine it.”This, too, is a heroic narrative, but it’s a heroism of defense. In this narrative it’s God and country that are sacred — hence the importance in conservative iconography of the Bible, the flag, the military and the founding fathers. But the subtext in this narrative is about moral order. For social conservatives, religion and the traditional family are so important in part because they foster self-control, create moral order and fend off chaos.

Part of Reagan’s political genius was that he told a single story about America that rallied libertarians and social conservatives, who are otherwise strange bedfellows. He did this by presenting liberal activist government as the single devil that is eternally bent on destroying two different sets of sacred values — economic liberty and moral order. Only if all nonliberals unite into a coalition of tribes can this devil be defeated.

We should consider ourselves as a product of these two interacting and often competing levels of evolutionary selection. Individual versus group selection results in a mix of altruism and selfishness, of virtue and sin, among the members of a society.

a pretty straightforward answer as to why conflicted emotions are at the very foundation of human existence

why we never seem to be able to work things out satisfactorily, particularly internationally.

religious strife is not the consequence of differences among people. It's about

our tribalistic tendencies to form groups, occupy territories and react fiercely to any intrusion or threat to ourselves, our tribe and our special creation story

Such intense instincts could arise in evolution only by group selection—tribe competing against tribe. For me, the peculiar qualities of faith are a logical outcome of this level of biological organization.

I see no way out of the problems that organized religion and tribalism create other than humans just becoming more honest and fully aware of themselves. Right now we're living in what Carl Sagan correctly termed a demon-haunted world. We have created a Star Wars civilization but we have Paleolithic emotions

I'm devoted to the kind of environmentalism that is particularly geared towards the conservation of the living world, the rest of life on Earth, the place we came from. We need to put a lot more attention into that as something that could unify people. Surely one moral precept we can agree on is to stop destroying our birthplace, the only home humanity will ever have.

we ought to have another go at the Enlightenment and use that as a common goal to explain and understand ourselves, to take that self-understanding which we so sorely lack as a foundation for what we do in the moral and political realm

I would like to see us improving education worldwide and putting a lot more emphasis—as some Asian and European countries have—on science and technology as part of basic education

Empowered by their own sources of information and their own interpretations of research, doubters have declared war on the consensus of experts.

Our lives are permeated by science and technology as never before. For many of us this new world is wondrous, comfortable, and rich in rewards—but also more complicated and sometimes unnerving. We now face risks we can’t easily analyze.

The world crackles with real and imaginary hazards, and distinguishing the former from the latter isn’t easy.

In this bewildering world we have to decide what to believe and how to act on that. In principle that’s what science is for.

“Science is not a body of facts,” says geophysicist Marcia McNutt,

“Science is a method for deciding whether what we choose to believe has a basis in the laws of nature or not.”

The scientific method leads us to truths that are less than self-evident, often mind-blowing, and sometimes hard to swallow.

We don’t believe you.

Galileo was put on trial and forced to recant. Two centuries later Charles Darwin escaped that fate. But his idea that all life on Earth evolved from a primordial ancestor and that we humans are distant cousins of apes, whales, and even deep-sea mollusks is still a big ask for a lot of people. So is another 19th-century notion: that carbon dioxide, an invisible gas that we all exhale all the time and that makes up less than a tenth of one percent of the atmosphere, could be affecting Earth’s climate.

we intellectually accept these precepts of science, we subconsciously cling to our intuitions

Shtulman’s research indicates that as we become scientifically literate, we repress our naive beliefs but never eliminate them entirely. They lurk in our brains, chirping at us as we try to make sense of the world.

Most of us do that by relying on personal experience and anecdotes, on stories rather than statistics.

We have trouble digesting randomness; our brains crave pattern and meaning.

we can deceive ourselves.

Even for scientists, the scientific method is a hard discipline. Like the rest of us, they’re vulnerable to what they call confirmation bias—the tendency to look for and see only evidence that confirms what they already believe. But unlike the rest of us, they submit their ideas to formal peer review before publishing them

other scientists will try to reproduce them

Scientific results are always provisional, susceptible to being overturned by some future experiment or observation. Scientists rarely proclaim an absolute truth or absolute certainty. Uncertainty is inevitable at the frontiers of knowledge.

Many people in the United States—a far greater percentage than in other countries—retain doubts about that consensus or believe that climate activists are using the threat of global warming to attack the free market and industrial society generally.

news media give abundant attention to such mavericks, naysayers, professional controversialists, and table thumpers. The media would also have you believe that science is full of shocking discoveries made by lone geniuses

science tells us the truth rather than what we’d like the truth to be. Scientists can be as dogmatic as anyone else—but their dogma is always wilting in the hot glare of new research.

But industry PR, however misleading, isn’t enough to explain why only 40 percent of Americans, according to the most recent poll from the Pew Research Center, accept that human activity is the dominant cause of global warming.

“science communication problem,”

yielded abundant new research into how people decide what to believe—and why they so often don’t accept the scientific consensus.

higher literacy was associated with stronger views—at both ends of the spectrum. Science literacy promoted polarization on climate, not consensus. According to Kahan, that’s because people tend to use scientific knowledge to reinforce beliefs that have already been shaped by their worldview.

“egalitarian” and “communitarian” mind-set are generally suspicious of industry and apt to think it’s up to something dangerous that calls for government regulation; they’re likely to see the risks of climate change.

“hierarchical” and “individualistic” mind-set respect leaders of industry and don’t like government interfering in their affairs; they’re apt to reject warnings about climate change, because they know what accepting them could lead to—some kind of tax or regulation to limit emissions.

For a hierarchical individualist, Kahan says, it’s not irrational to reject established climate science: Accepting it wouldn’t change the world, but it might get him thrown out of his tribe.

Science appeals to our rational brain, but our beliefs are motivated largely by emotion, and the biggest motivation is remaining tight with our peers.

organizations funded in part by the fossil fuel industry have deliberately tried to undermine the public’s understanding of the scientific consensus by promoting a few skeptics.

Internet makes it easier than ever for climate skeptics and doubters of all kinds to find their own information and experts

Internet has democratized information, which is a good thing. But along with cable TV, it has made it possible to live in a “filter bubble” that lets in only the information with which you already agree.

How to convert climate skeptics? Throwing more facts at them doesn’t help.

people need to hear from believers they can trust, who share their fundamental values.

We believe in scientific ideas not because we have truly evaluated all the evidence but because we feel an affinity for the scientific community.

“Believing in evolution is just a description about you. It’s not an account of how you reason.”

evolution actually happened. Biology is incomprehensible without it. There aren’t really two sides to all these issues. Climate change is happening. Vaccines really do save lives. Being right does matter—and the science tribe has a long track record of getting things right in the end. Modern society is built on things it got right.

Doubting science also has consequences.

In the climate debate the consequences of doubt are likely global and enduring. In the U.S., climate change skeptics have achieved their fundamental goal of halting legislative action to combat global warming.

“That line between science communication and advocacy is very hard to step back from,”

It’s their very detachment, what you might call the cold-bloodedness of science, that makes science the killer app.

that need to fit in is so strong that local values and local opinions are always trumping science.

not a sin to change your mind when the evidence demands it.

for the best scientists, the truth is more important than the tribe.

Students come away thinking of science as a collection of facts, not a method.

Shtulman’s research has shown that even many college students don’t really understand what evidence is.

“Everybody should be questioning,” says McNutt. “That’s a hallmark of a scientist. But then they should use the scientific method, or trust people using the scientific method, to decide which way they fall on those questions.”

science has made us the dominant organisms,

incredibly rapid change, and it’s scary sometimes. It’s not all progress.

Suicide rates are now at a 30-year high. Depression rates have increased tenfold since 1960, which is not only a result of greater reporting.

Most children born to mothers under 30 are born outside of marriage.

There’s been a steady 30-year decline in Americans’ satisfaction with the peer-to-peer relationships at work.

“During my years caring for patients, the most common pathology I saw was not heart disease or diabetes; it was loneliness.”

Weak social connections have health effects similar to smoking 15 cigarettes a day, and a greater negative effect than obesity, he said.

In 2012, 5.9 percent of young people suffered from severe mental health issues. By 2015 it was 8.2 percent.

More and more Americans are socially poor. And yet it is very hard for the socially wealthy to even see this fact.

Most of the questions he faced at the congressional hearings and most of the analysis in the press were about Facebook’s failure to protect privacy. That’s the sort of thing that may be uppermost on your mind if you are socially wealthy

But the big issue surrounding Facebook is not privacy. It’s that Facebook and other social media companies are feeding this epidemic of loneliness and social isolation.

heavy internet users are much less likely to have contact with their proximate neighbors to exchange favors and extend care. There’s something big happening to the social structure of neighborhoods.

The British anthropologist Robin Dunbar observes that human societies exist on three levels: the clan (your family and close friends), the village (your local community) and the tribe (your larger group)

In America today you would say that the clans have polarized, the villages have been decimated and the tribes have become weaponized.

That is, some highly educated families have helicopter parents while less fortunate families have absent parents. The middle ring cross-class associations of town and neighborhood have fallen apart. People try to compensate for the lack of intimate connection by placing their moral and emotional longings on their political, ethnic and other tribes, turning them viciously on each other.

many of us who are socially wealthy don’t really know how the other half lives.

the stage was set for the major transformation, which began in 2009: the intensification of viral dynamics.

Before 2009, Facebook had given users a simple timeline––a never-ending stream of content generated by their friends and connections, with the newest posts at the top and the oldest ones at the bottom

That began to change in 2009, when Facebook offered users a way to publicly “like” posts with the click of a button. That same year, Twitter introduced something even more powerful: the “Retweet” button, which allowed users to publicly endorse a post while also sharing it with all of their followers.

“Like” and “Share” buttons quickly became standard features of most other platforms.

Facebook developed algorithms to bring each user the content most likely to generate a “like” or some other interaction, eventually including the “share” as well.

Later research showed that posts that trigger emotions––especially anger at out-groups––are the most likely to be shared.

By 2013, social media had become a new game, with dynamics unlike those in 2008. If you were skillful or lucky, you might create a post that would “go viral” and make you “internet famous”

If you blundered, you could find yourself buried in hateful comments. Your posts rode to fame or ignominy based on the clicks of thousands of strangers, and you in turn contributed thousands of clicks to the game.

This new game encouraged dishonesty and mob dynamics: Users were guided not just by their true preferences but by their past experiences of reward and punishment,

As a social psychologist who studies emotion, morality, and politics, I saw this happening too. The newly tweaked platforms were almost perfectly designed to bring out our most moralistic and least reflective selves. The volume of outrage was shocking.

It was just this kind of twitchy and explosive spread of anger that James Madison had tried to protect us from as he was drafting the U.S. Constitution.

The Framers of the Constitution were excellent social psychologists. They knew that democracy had an Achilles’ heel because it depended on the collective judgment of the people, and democratic communities are subject to “the turbulency and weakness of unruly passions.”

The key to designing a sustainable republic, therefore, was to build in mechanisms to slow things down, cool passions, require compromise, and give leaders some insulation from the mania of the moment while still holding them accountable to the people periodically, on Election Day.

The tech companies that enhanced virality from 2009 to 2012 brought us deep into Madison’s nightmare.

a less quoted yet equally important insight, about democracy’s vulnerability to triviality.

Madison notes that people are so prone to factionalism that “where no substantial occasion presents itself, the most frivolous and fanciful distinctions have been sufficient to kindle their unfriendly passions and excite their most violent conflicts.”

Social media has both magnified and weaponized the frivolous.

It’s not just the waste of time and scarce attention that matters; it’s the continual chipping-away of trust.

a democracy depends on widely internalized acceptance of the legitimacy of rules, norms, and institutions.

when citizens lose trust in elected leaders, health authorities, the courts, the police, universities, and the integrity of elections, then every decision becomes contested; every election becomes a life-and-death struggle to save the country from the other side

The most recent Edelman Trust Barometer (an international measure of citizens’ trust in government, business, media, and nongovernmental organizations) showed stable and competent autocracies (China and the United Arab Emirates) at the top of the list, while contentious democracies such as the United States, the United Kingdom, Spain, and South Korea scored near the bottom (albeit above Russia).

The literature is complex—some studies show benefits, particularly in less developed democracies—but the review found that, on balance, social media amplifies political polarization; foments populism, especially right-wing populism; and is associated with the spread of misinformation.

When people lose trust in institutions, they lose trust in the stories told by those institutions. That’s particularly true of the institutions entrusted with the education of children.

Facebook and Twitter make it possible for parents to become outraged every day over a new snippet from their children’s history lessons––and math lessons and literature selections, and any new pedagogical shifts anywhere in the country

The motives of teachers and administrators come into question, and overreaching laws or curricular reforms sometimes follow, dumbing down education and reducing trust in it further.

young people educated in the post-Babel era are less likely to arrive at a coherent story of who we are as a people, and less likely to share any such story with those who attended different schools or who were educated in a different decade.

former CIA analyst Martin Gurri predicted these fracturing effects in his 2014 book, The Revolt of the Public. Gurri’s analysis focused on the authority-subverting effects of information’s exponential growth, beginning with the internet in the 1990s. Writing nearly a decade ago, Gurri could already see the power of social media as a universal solvent, breaking down bonds and weakening institutions everywhere it reached.

he notes a constructive feature of the pre-digital era: a single “mass audience,” all consuming the same content, as if they were all looking into the same gigantic mirror at the reflection of their own society. I

The digital revolution has shattered that mirror, and now the public inhabits those broken pieces of glass. So the public isn’t one thing; it’s highly fragmented, and it’s basically mutually hostile

Facebook, Twitter, YouTube, and a few other large platforms unwittingly dissolved the mortar of trust, belief in institutions, and shared stories that had held a large and diverse secular democracy together.

I think we can date the fall of the tower to the years between 2011 (Gurri’s focal year of “nihilistic” protests) and 2015, a year marked by the “great awokening” on the left and the ascendancy of Donald Trump on the right.

Twitter can overpower all the newspapers in the country, and stories cannot be shared (or at least trusted) across more than a few adjacent fragments—so truth cannot achieve widespread adherence.

fter Babel, nothing really means anything anymore––at least not in a way that is durable and on which people widely agree.

Politics After Babel

“Politics is the art of the possible,” the German statesman Otto von Bismarck said in 1867. In a post-Babel democracy, not much may be possible.

The ideological distance between the two parties began increasing faster in the 1990s. Fox News and the 1994 “Republican Revolution” converted the GOP into a more combative party.

So cross-party relationships were already strained before 2009. But the enhanced virality of social media thereafter made it more hazardous to be seen fraternizing with the enemy or even failing to attack the enemy with sufficient vigor.

What changed in the 2010s? Let’s revisit that Twitter engineer’s metaphor of handing a loaded gun to a 4-year-old. A mean tweet doesn’t kill anyone; it is an attempt to shame or punish someone publicly while broadcasting one’s own virtue, brilliance, or tribal loyalties. It’s more a dart than a bullet

from 2009 to 2012, Facebook and Twitter passed out roughly 1 billion dart guns globally. We’ve been shooting one another ever since.

“devoted conservatives,” comprised 6 percent of the U.S. population.

the warped “accountability” of social media has also brought injustice—and political dysfunction—in three ways.

First, the dart guns of social media give more power to trolls and provocateurs while silencing good citizens.

a small subset of people on social-media platforms are highly concerned with gaining status and are willing to use aggression to do so.

Across eight studies, Bor and Petersen found that being online did not make most people more aggressive or hostile; rather, it allowed a small number of aggressive people to attack a much larger set of victims. Even a small number of jerks were able to dominate discussion forums,

Additional research finds that women and Black people are harassed disproportionately, so the digital public square is less welcoming to their voices.

Second, the dart guns of social media give more power and voice to the political extremes while reducing the power and voice of the moderate majority.

The “Hidden Tribes” study, by the pro-democracy group More in Common, surveyed 8,000 Americans in 2017 and 2018 and identified seven groups that shared beliefs and behaviors.

Social media has given voice to some people who had little previously, and it has made it easier to hold powerful people accountable for their misdeeds

The group furthest to the left, the “progressive activists,” comprised 8 percent of the population. The progressive activists were by far the most prolific group on social media: 70 percent had shared political content over the previous year. The devoted conservatives followed, at 56 percent.

These two extreme groups are similar in surprising ways. They are the whitest and richest of the seven groups, which suggests that America is being torn apart by a battle between two subsets of the elite who are not representative of the broader society.

they are the two groups that show the greatest homogeneity in their moral and political attitudes.

likely a result of thought-policing on social media:

political extremists don’t just shoot darts at their enemies; they spend a lot of their ammunition targeting dissenters or nuanced thinkers on their own team.

Finally, by giving everyone a dart gun, social media deputizes everyone to administer justice with no due process. Platforms like Twitter devolve into the Wild West, with no accountability for vigilantes.

Enhanced-virality platforms thereby facilitate massive collective punishment for small or imagined offenses, with real-world consequences, including innocent people losing their jobs and being shamed into suicide

we don’t get justice and inclusion; we get a society that ignores context, proportionality, mercy, and truth.

Since the tower fell, debates of all kinds have grown more and more confused. The most pervasive obstacle to good thinking is confirmation bias, which refers to the human tendency to search only for evidence that confirms our preferred beliefs

search engines were supercharging confirmation bias, making it far easier for people to find evidence for absurd beliefs and conspiracy theorie

The most reliable cure for confirmation bias is interaction with people who don’t share your beliefs. They confront you with counterevidence and counterargument.

In his book The Constitution of Knowledge, Jonathan Rauch describes the historical breakthrough in which Western societies developed an “epistemic operating system”—that is, a set of institutions for generating knowledge from the interactions of biased and cognitively flawed individuals

English law developed the adversarial system so that biased advocates could present both sides of a case to an impartial jury.

Newspapers full of lies evolved into professional journalistic enterprises, with norms that required seeking out multiple sides of a story, followed by editorial review, followed by fact-checking.

Universities evolved from cloistered medieval institutions into research powerhouses, creating a structure in which scholars put forth evidence-backed claims with the knowledge that other scholars around the world would be motivated to gain prestige by finding contrary evidence.

Part of America’s greatness in the 20th century came from having developed the most capable, vibrant, and productive network of knowledge-producing institutions in all of human history

But this arrangement, Rauch notes, “is not self-maintaining; it relies on an array of sometimes delicate social settings and understandings, and those need to be understood, affirmed, and protected.”

This, I believe, is what happened to many of America’s key institutions in the mid-to-late 2010s. They got stupider en masse because social media instilled in their members a chronic fear of getting darted

it was so pervasive that it established new behavioral norms backed by new policies seemingly overnight

Participants in our key institutions began self-censoring to an unhealthy degree, holding back critiques of policies and ideas—even those presented in class by their students—that they believed to be ill-supported or wrong.

The stupefying process plays out differently on the right and the left because their activist wings subscribe to different narratives with different sacred values.

The “Hidden Tribes” study tells us that the “devoted conservatives” score highest on beliefs related to authoritarianism. They share a narrative in which America is eternally under threat from enemies outside and subversives within; they see life as a battle between patriots and traitors.

they are psychologically different from the larger group of “traditional conservatives” (19 percent of the population), who emphasize order, decorum, and slow rather than radical change.

The traditional punishment for treason is death, hence the battle cry on January 6: “Hang Mike Pence.”

Right-wing death threats, many delivered by anonymous accounts, are proving effective in cowing traditional conservatives

The wave of threats delivered to dissenting Republican members of Congress has similarly pushed many of the remaining moderates to quit or go silent, giving us a party ever more divorced from the conservative tradition, constitutional responsibility, and reality.

The stupidity on the right is most visible in the many conspiracy theories spreading across right-wing media and now into Congress.

The Democrats have also been hit hard by structural stupidity, though in a different way. In the Democratic Party, the struggle between the progressive wing and the more moderate factions is open and ongoing, and often the moderates win.

The problem is that the left controls the commanding heights of the culture: universities, news organizations, Hollywood, art museums, advertising, much of Silicon Valley, and the teachers’ unions and teaching colleges that shape K–12 education. And in many of those institutions, dissent has been stifled:

Liberals in the late 20th century shared a belief that the sociologist Christian Smith called the “liberal progress” narrative, in which America used to be horrifically unjust and repressive, but, thanks to the struggles of activists and heroes, has made (and continues to make) progress toward realizing the noble promise of its founding.

It is also the view of the “traditional liberals” in the “Hidden Tribes” study (11 percent of the population), who have strong humanitarian values, are older than average, and are largely the people leading America’s cultural and intellectual institutions.

when the newly viralized social-media platforms gave everyone a dart gun, it was younger progressive activists who did the most shooting, and they aimed a disproportionate number of their darts at these older liberal leaders.

Confused and fearful, the leaders rarely challenged the activists or their nonliberal narrative in which life at every institution is an eternal battle among identity groups over a zero-sum pie, and the people on top got there by oppressing the people on the bottom. This new narrative is rigidly egalitarian––focused on equality of outcomes, not of rights or opportunities. It is unconcerned with individual rights.

The universal charge against people who disagree with this narrative is not “traitor”; it is “racist,” “transphobe,” “Karen,” or some related scarlet letter marking the perpetrator as one who hates or harms a marginalized group.

The punishment that feels right for such crimes is not execution; it is public shaming and social death.

anyone on Twitter had already seen dozens of examples teaching the basic lesson: Don’t question your own side’s beliefs, policies, or actions. And when traditional liberals go silent, as so many did in the summer of 2020, the progressive activists’ more radical narrative takes over as the governing narrative of an organization.

This is why so many epistemic institutions seemed to “go woke” in rapid succession that year and the next, beginning with a wave of controversies and resignations at The New York Times and other newspapers, and continuing on to social-justice pronouncements by groups of doctors and medical associations

The problem is structural. Thanks to enhanced-virality social media, dissent is punished within many of our institutions, which means that bad ideas get elevated into official policy.

In a 2018 interview, Steve Bannon, the former adviser to Donald Trump, said that the way to deal with the media is “to flood the zone with shit.” He was describing the “firehose of falsehood” tactic pioneered by Russian disinformation programs to keep Americans confused, disoriented, and angry.

artificial intelligence is close to enabling the limitless spread of highly believable disinformation. The AI program GPT-3 is already so good that you can give it a topic and a tone and it will spit out as many essays as you like, typically with perfect grammar and a surprising level of coherence.

Renée DiResta, the research manager at the Stanford Internet Observatory, explained that spreading falsehoods—whether through text, images, or deep-fake videos—will quickly become inconceivably easy. (She co-wrote the essay with GPT-3.)

American factions won’t be the only ones using AI and social media to generate attack content; our adversaries will too.

In the 20th century, America’s shared identity as the country leading the fight to make the world safe for democracy was a strong force that helped keep the culture and the polity together.

In the 21st century, America’s tech companies have rewired the world and created products that now appear to be corrosive to democracy, obstacles to shared understanding, and destroyers of the modern tower.

What changes are needed?

I can suggest three categories of reforms––three goals that must be achieved if democracy is to remain viable in the post-Babel era.

We must harden democratic institutions so that they can withstand chronic anger and mistrust, reform social media so that it becomes less socially corrosive, and better prepare the next generation for democratic citizenship in this new age.

Harden Democratic Institutions

we must reform key institutions so that they can continue to function even if levels of anger, misinformation, and violence increase far above those we have today.

Reforms should reduce the outsize influence of angry extremists and make legislators more responsive to the average voter in their district.

One example of such a reform is to end closed party primaries, replacing them with a single, nonpartisan, open primary from which the top several candidates advance to a general election that also uses ranked-choice voting

A second way to harden democratic institutions is to reduce the power of either political party to game the system in its favor, for example by drawing its preferred electoral districts or selecting the officials who will supervise elections

These jobs should all be done in a nonpartisan way.

Reform Social Media

Social media’s empowerment of the far left, the far right, domestic trolls, and foreign agents is creating a system that looks less like democracy and more like rule by the most aggressive.

it is within our power to reduce social media’s ability to dissolve trust and foment structural stupidity. Reforms should limit the platforms’ amplification of the aggressive fringes while giving more voice to what More in Common calls “the exhausted majority.”

the main problem with social media is not that some people post fake or toxic stuff; it’s that fake and outrage-inducing content can now attain a level of reach and influence that was not possible before

Perhaps the biggest single change that would reduce the toxicity of existing platforms would be user verification as a precondition for gaining the algorithmic amplification that social media offers.

One of the first orders of business should be compelling the platforms to share their data and their algorithms with academic researchers.

Prepare the Next Generation

Childhood has become more tightly circumscribed in recent generations––with less opportunity for free, unstructured play; less unsupervised time outside; more time online. Whatever else the effects of these shifts, they have likely impeded the development of abilities needed for effective self-governance for many young adults

Depression makes people less likely to want to engage with new people, ideas, and experiences. Anxiety makes new things seem more threatening. As these conditions have risen and as the lessons on nuanced social behavior learned through free play have been delayed, tolerance for diverse viewpoints and the ability to work out disputes have diminished among many young people

Students did not just say that they disagreed with visiting speakers; some said that those lectures would be dangerous, emotionally devastating, a form of violence. Because rates of teen depression and anxiety have continued to rise into the 2020s, we should expect these views to continue in the generations to follow, and indeed to become more severe.

The most important change we can make to reduce the damaging effects of social media on children is to delay entry until they have passed through puberty.

The age should be raised to at least 16, and companies should be held responsible for enforcing it.

et them out to play. Stop starving children of the experiences they most need to become good citizens: free play in mixed-age groups of children with minimal adult supervision

while social media has eroded the art of association throughout society, it may be leaving its deepest and most enduring marks on adolescents. A surge in rates of anxiety, depression, and self-harm among American teens began suddenly in the early 2010s. (The same thing happened to Canadian and British teens, at the same time.) The cause is not known, but the timing points to social media as a substantial contributor—the surge began just as the large majority of American teens became daily users of the major platforms.

What would it be like to live in Babel in the days after its destruction? We know. It is a time of confusion and loss. But it is also a time to reflect, listen, and build.

In recent years, Americans have started hundreds of groups and organizations dedicated to building trust and friendship across the political divide, including BridgeUSA, Braver Angels (on whose board I serve), and many others listed at BridgeAlliance.us. We cannot expect Congress and the tech companies to save us. We must change ourselves and our communities.

when we look away from our dysfunctional federal government, disconnect from social media, and talk with our neighbors directly, things seem more hopeful. Most Americans in the More in Common report are members of the “exhausted majority,” which is tired of the fighting and is willing to listen to the other side and compromise. Most Americans now see that social media is having a negative impact on the country, and are becoming more aware of its damaging effects on children.

To understand why this matters, you have to know a little bit about the many tribes within the world of economics.

There are the academic economists who study the forces shaping the modern economy. Their work is rigorous but often obscure. Some of them end up in important policy jobs (See: Bernanke, B.) or write books for a mass audience (Piketty, T.), but many labor in the halls of academia for decades writing carefully vetted articles for academic journals that are rigorous as can be but are read by, to a first approximation, no one.

Then there are the economists in what can broadly be called the business forecasting community. They wear nicer suits than the academics, and are better at offering a glib, confident analysis of the latest jobs numbers delivered on CNBC or in front of a room full of executives who are their clients. They work for ratings firms like S.&P., forecasting firms like Macroeconomic Advisers and the economics research departments of all the big banks.

they are trying to do the practical work of explaining to clients — companies trying to forecast future demand, investors trying to allocate assets — how the economy is likely to evolve. They’re not really driven by ideology, or by models that are rigorous enough in their theoretical underpinnings to pass academic peer review. Rather, their success or failure hinges on whether they’re successful at giving those clients an accurate picture of where the economy is heading.

worries that income inequality is a factor behind subpar economic growth over the last five years (and really the last 15 years) is going from an idiosyncratic argument made mainly by left-of center economists to something that even the tribe of business forecasters needs to wrestle with.

Because the affluent tend to save more of what they earn rather than spend it, as more and more of the nation’s income goes to people at the top income brackets, there isn’t enough demand for goods and services to maintain strong growth, and attempts to bridge that gap with debt feed a boom-bust cycle of crises, the report argues. High inequality can feed on itself, as the wealthy use their resources to influence the political system toward policies that help maintain that advantage, like low tax rates on high incomes and low estate taxes, and underinvestment in education and infrastructur

The report itself does not break any major new analytical or empirical ground. It spends many pages summarizing the findings of various academic and government economists who have studied inequality and its discontents, and stops short of recommending any radical policy changes

a defined territory, a permanent population, a government, and “the capacity to enter into relations with other states”.

The globe, it turns out, is full of small (and not so small) regions that have all the trappings of a real country

and are ignored on most world maps.

Middleton, a geographer at the University of Oxford, has now charted these hidden lands in his new book, An Atlas of Countries that Don’t Exist

Middleton’s quest began, appropriately enough, with Narnia

The problem, he says, is that we don’t have a watertight definition of what a country is. “Which as a geographer, is kind of shocking

In Australia, meanwhile, the Republic of Murrawarri was founded in 2013, after the indigenous tribe wrote a letter to Queen Elizabeth II asking her to prove her legitimacy to govern their land.

Yet many countries that meet these criteria aren‘t members of the United Nations (commonly accepted as the final seal of a country’s statehood).

many of them are instead members of the “Unrepresented United Nations – an alternative body to champion their rights.

In fact, you have almost certainly, unknowingly, visited one.

The others are less famous, but they are by no means less serious

One of the most troubling histories, he says, concerns the Republic of Lakotah (with a population of 100,000). Bang in the centre of the United States of America (just east of the Rocky Mountains), the republic is an attempt to reclaim the sacred Black Hills for the Lakota Sioux tribe.

Their plight began in the 18th Century, and by 1868 they had finally signed a deal with the US government that promised the right to live on the Black Hills. Unfortunately, they hadn’t accounted for a gold rush

Similar battles are being fought across every continent.

A handful of the names will be familiar to anyone who has read a newspaper: territories such as Taiwan, Tibet, Greenland, and Northern Cyprus.

Christiania, an enclave in the heart of Copenhagen.

On 26 September that year, they declared it independent, with its own “direct democracy”, in which each of the inhabitants (now numbering 850) could vote on any important matter.

a blind eye to the activities

perhaps we need to rethink the concept of the nation-state altogether? He points to Antarctica, a continent shared peacefully among the international community

The last pages of Middleton’s Atlas contain two radical examples that question everything we think we mean by the word ‘country’.

“They all raise the possibility that countries as we know them are not the only legitimate basis for ordering the planet,

As we have moved more of our lives onto the internet, we have stopped living in actual communities. Instead we have created virtual communities where everyone thinks the same. We do not have to worry about the homeless man under the bridge because he is no longer part of our community. He is someone else’s problem. But that simply is not true.

Not everything should be political, and we can only make everything political when we decide the other side is evil just because they disagree with us. We can see the world only in this polarized way if we never take the time to know anyone on the other side, if we never find ways to build friendship despite our differences.

Even as the internet provides us great advances, it also segments us. We have social-media tribes and our self-esteem is based on likes and retweets. We have hundreds of television channels and even more video choices online where Hollywood no longer has to worry about broad appeal. There is a channel for everyone, and everyone in the tribe will get the inside jokes. Social-media interactions have replaced the value of character.

The kitchen table is the most important tool they have to reshape their community. Preparing a home-cooked meal and inviting people over, both those we know and those we want to know, forces us to find common ground.

The truth, though, is that our Facebook friends are probably not going to water our flowers while we are on vacation and our Twitter followers will not bring us a meal if we are sick. But the actual human being next door might do both if we meet him.

Every person has an interesting story to tell. I want my children to know my story.

We may also never find that common ground with people whose politics or faith conflicts with ours. But we owe it to one another to disagree agreeably, without anger or intimidation, whether on a front porch or a Facebook page. A little more grace among us all would go a long way toward healing the nation.

The general experience of losing one’s language to American preference is not unique to being Indigenous. It’s an American philosophy, one that is echoed in the experience of the children of immigrants whose parents do not teach them their language, in an attempt to shield them from racism. The president enforces a regime of assimilation when he declares, “This is a country where we speak English. It’s English. You have to speak English!”

Many of these languages are not even a full lifetime away from disappearing. They exist for as long as the heart of the elder who carries the words continues to beat. One day, that heart will stop, and so too will the language.

Barrett is a professor of psychology at Northeastern

her research has led her to conclude that each of us constructs them in our own individual ways, from a diversity of sources: our internal sensations, our reactions to the environments we live in, our ever-evolving bodies of experience and learning, our cultures.

if Barrett is correct, we’ll need to rethink how we interpret mental illness, how we understand the mind and self, and even what psychology as a whole should become in the 21st century.

The problem was the options that Ekman had given his subjects when asking them to identify the emotions shown on the faces they were presented with. Those options, Barrett discovered, had limited the ways in which people allowed themselves to think. Barrett explained the problem to me this way: “I can break that experiment really easily, just by removing the words. I can just show you a face and ask how this person feels. Or I can show you two faces, two scowling faces, and I can say, ‘Do these people feel the same thing?’ And agreement drops into the toilet.”

Just as that first picture of the bee actually wasn’t a picture of a bee for me until I taught myself that it was, my emotions aren’t actually emotions until I’ve taught myself to think of them that way. Without that, I have only a meaningless mishmash of information about what I’m feeling.

emotion isn’t a simple reflex or a bodily state that’s hard-wired into our DNA, and it’s certainly not universally expressed. It’s a contingent act of perception that makes sense of the information coming in from the world around you, how your body is feeling in the moment, and everything you’ve ever been taught to understand as emotion. Culture to culture, person to person even, it’s never quite the same. What’s felt as sadness in one person might as easily be felt as weariness in another, or frustration in someone else.

The brain, it turns out, doesn’t consciously process every single piece of information that comes its way. Think of how impossibly distracting the regular act of blinking would be if it did. Instead, it pays attention to what you need to pay attention to, then raids your memory stores to fill in the blanks.

In many quarters, Barrett was angrily attacked for her ideas, and she’s been the subject of criticism ever since. “I think Lisa does a disservice to the actual empirical progress that we’re making,” says Dacher Keltner, a Berkeley psychologist

Keltner told me that he himself has coded thousands of facial expressions using Ekman’s system, and the results are strikingly consistent: Certain face-emotion combinations recur regularly, and others never occur. “That tells me, ‘Wow, this approach to distinct emotions has real power,’” he says.

Ekman reached the peak of his fame in the years following 2001. That’s the year the American Psychological Association named him one of the most influential psychologists of the 20th century. The next year, Malcolm Gladwell wrote an article about him in the New Yorker, and in 2003 he began working pro bono for the TSA. A year later, riding the updraft of success, he left his university post and started the Paul Ekman Group,

a small research team to visit the isolated Himba tribe in Namibia, in southern Africa. The plan was this: The team, led by Maria Gendron, would do a study similar to Ekman’s original cross-cultural one, but without providing any of the special words or context-heavy stories that Ekman had used to guide his subjects’ answers. Barrett’s researchers would simply hand a jumbled pile of different expressions (happy, sad, fearful, angry, disgusted, and neutral) to their subjects, and would ask them to sort them into six piles. If emotional expressions are indeed universal, they reasoned, then the Himba would put all low-browed, tight-lipped expressions into an anger pile, all wrinkled-nose faces into a disgust pile, and so on.

It didn’t happen that way. The Himba sorted some of the faces in ways that aligned with Ekman’s theory: smiling faces went into one pile, wide-eyed fearful faces went into another, and affectless faces went mostly into a third. But in the other three piles, the Himba mixed up angry scowls, disgusted grimaces, and sad frowns. Without any suggestive context, of the kind that Ekman had originally provided, they simply didn’t recognize the differences that leap out so naturally to Westerners.

“What we’re trying to do,” she told me, “is to just get people to pay attention to the fact that there’s a mountain of evidence that does not support the idea that facial expressions are universally recognized as emotional expressions.” That’s the crucial point, of course, because if we acknowledge that, then the entire edifice that Paul Ekman and others have been constructing for the past half-century comes tumbling down. And all sorts of things that we take for granted today—how we understand ourselves and our relationships with others, how we practice psychology

Barrett’s theory is still only in its infancy. But other researchers are beginning to take up her ideas, sometimes in part, sometimes in full, and where the science will take us as it expands is impossible to predict. It’s even possible that Barrett will turn out to be wrong, as she herself acknowledges. “Every scientist has to face that,” she says. Still, if she is right, then perhaps the most important change we’ll need to make is in our own heads. If our emotions are not universal physiological responses but concepts we’ve constructed from various biological signals and stashed memories, then perhaps we can exercise more control over our emotional lives than we’ve assumed.

“Every experience you have now is seeding your experience for the future,” Barrett told me. “Knowing that, would you choose to do what you’re doing now?” She paused a beat and looked me in the eye. “Well? Would you? You are the architect of your own experience.”

“And one of the things we want is to spend more time with people who think like us and less with people who are different,” Haidt added. “The Facebook effect isn’t trivial. But it’s catalyzing or amplifying a tendency that was already there.”

prevalent for many users are the posts we see from friends and from other people and groups we follow on the network, and this information is utterly contingent on choices we ourselves make

The Internet isn’t rigged to give us right or left, conservative or liberal — at least not until we rig it that way. It’s designed to give us more of the same, whatever that same is

So it goes with the fiction we read, the movies we watch, the music we listen to and, scarily, the ideas we subscribe to. They’re not challenged. They’re validated and reinforced.

this colors our days, or rather bleeds them of color, reducing them to a single hue.

Facebook, along with other social media, definitely conspires in this. Haidt noted that it often discourages dissent within a cluster of friends by accelerating shaming. He pointed to the enforced political correctness among students at many colleges.

Carnival barkers, conspiracy theories, willful bias and nasty partisanship aren’t anything new, and they haven’t reached unprecedented heights today. But what’s remarkable and sort of heartbreaking is the way they’re fed by what should be strides in our ability to educate ourselves.

The proliferation of cable television networks and growth of the Internet promised to expand our worlds, not shrink them. Instead they’ve enhanced the speed and thoroughness with which we retreat into enclaves of the like-minded.

there’s no argument that in an era that teems with choice, brims with niche marketing and exalts individualism to the extent that ours does, we’re sorting ourselves with a chillingly ruthless efficiency. We’ve surrendered universal points of reference. We’ve lost common ground.

Marc Dunkelman, adding that it also makes it easier for us to avoid “face-to-face interactions with diverse ideas.” He touched on this in an incisive 2014 book, “The Vanishing Neighbor,” which belongs with Haidt’s work and with “Bowling Alone,” “Coming Apart” and “The Fractured Republic” in the literature of modern American fragmentation, a booming genre all its own.

We’re less committed to, and trustful of, large institutions than we were at times in the past. We question their wisdom and substitute it with the groupthink of micro-communities, many of which we’ve formed online, and their sensibilities can be more peculiar and unforgiving.

We construct precisely contoured echo chambers of affirmation that turn conviction into zeal, passion into fury, disagreements with the other side into the demonization of it

It’s not about some sorcerer’s algorithm. It’s about a tribalism that has existed for as long as humankind has and is now rooted in the fertile soil of the Internet, which is coaxing it toward a full and insidious flower

Moken children were able to see twice as well underwater as European children by simply shrinking their pupils to increase the depth of field and muscularly changing the shape of their eye lenses.

in theory, anyone can learn how to control their bodies to achieve these amazing underwater adaptations.

When I wrote in August 2015 that Mr. Trump was a cartoon version of every left-wing media stereotype of the reactionary, nativist, misogynist right, I thought that I was well within the mainstream of conservative thought — only to find conservative Trump critics denounced for apostasy by a right that decided that it was comfortable with embracing Trumpism.

relatively few of my listeners bought into the crude nativism Mr. Trump was selling at his rallies.

What they did buy into was the argument that this was a “binary choice.” No matter how bad Mr. Trump was, my listeners argued, he could not possibly be as bad as Mrs. Clinton. You simply cannot overstate this as a factor in the final outcome

Even among Republicans who had no illusions about Mr. Trump’s character or judgment, the demands of that tribal loyalty took precedence. To resist was an act of betrayal.

In this binary tribal world, where everything is at stake, everything is in play, there is no room for quibbles about character, or truth, or principles.

If everything — the Supreme Court, the fate of Western civilization, the survival of the planet — depends on tribal victory, then neither individuals nor ideas can be determinative.

As our politics have become more polarized, the essential loyalties shift from ideas, to parties, to tribes, to individuals. Nothing else ultimately matters.

For many listeners, nothing was worse than Hillary Clinton. Two decades of vilification had taken their toll: Listeners whom I knew to be decent, thoughtful individuals began forwarding stories with conspiracy theories about President Obama and Mrs. Clinton — that he was a secret Muslim, that she ran a child sex ring out of a pizza parlor. When I tried to point out that such stories were demonstrably false, they generally refused to accept evidence that came from outside their bubble. The echo chamber had morphed into a full-blown alternate reality silo of conspiracy theories, fake news and propaganda.

In this political universe, voters accept that they must tolerate bizarre behavior, dishonesty, crudity and cruelty, because the other side is always worse; the stakes are such that no qualms can get in the way of the greater cause.

When it became clear that I was going to remain #NeverTrump, conservatives I had known and worked with for more than two decades organized boycotts of my show. One prominent G.O.P. activist sent out an email blast calling me a “Judas goat,” and calling for postelection retribution.

And then, there was social media. Unless you have experienced it, it’s difficult to describe the virulence of the Twitter storms that were unleashed on Trump skeptics. In my timelines, I found myself called a “cuckservative,” a favorite gibe of white nationalists; and someone Photoshopped my face into a gas chamber. Under the withering fire of the trolls, one conservative commentator and Republican political leader after another fell in line.