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“It became apparent just how many hypotheses there were out there,” Dr. Harper said. “Thirty-plus over the past 10 years.”

it’s a mistake to search for a single cause. They propose that a tangled web of factors and feedbacks were responsible for evolution’s big bang.

Long before the Cambrian explosion, Dr. Smith and Dr. Harper argue, one lineage of animals had already evolved the genetic capacity for spectacular diversity. Known as the bilaterians, they probably looked at first like little crawling worms.

It took a global flood to tap that capacity,

They offered evidence that the Cambrian Explosion was preceded by a rise in sea level that submerged vast swaths of land, eroding the drowned rocks.

“There’s a big kick that correlates with the sea level rise,” Dr. Smith said of the fossil record. He and Dr. Harper propose that this kick happened thanks to the new habitats created by the sea level rise. These shallow coastal habitats were bathed in sunlight and nourished with eroding nutrients like phosphates. Animals colonized these new fertile habitats, Dr. Smith and Dr. Harper argue, and evolved to take up new ecological niches.

The erosion of the coastlines released calcium, which can be toxic to cells. In order to survive, animals had to evolve ways to rid themselves of the poison. One solution may have been to pack the calcium into crystals, which eventually evolved into shells, bones, and other hard tissues.

These shells and other hard tissues sped up animal evolution even more. Predators could grow hard claws and jaws for killing prey, and their prey could evolve hard shells and spines to defend themselves. Animals became locked in an evolutionary arms race.

Between globalization, the Great Recession, and the not-so-great recovery, the middle class was slammed.

they felt it, too. Manyika’s research team asked more than 6,000 people in the United States, the U.K., and France to describe their economic status. Between one-third and 40 percent of respondents in each country felt that their incomes were falling behind. “And these people tended to blame free trade and immigrants for hurting their wages and ruining their culture,”

Anti-elite sentiment “has become the most potent political force in Europe,” writes Martin Gurri, author of The Revolt of the Public and the Crisis of Authority in the New Millennium. “It brought Brexit in Britain, electoral defeat to German chancellor Angela Merkel, drove protests in France, shattered so many political coalitions that governed Europe since World War II, and raised to prominence new parties and persons nominally attached to the right or the left but always fractious, sectarian, ‘populist.’”

The changing media landscape is part of the story, too

In other words, saving the American middle class might take a leftist intervention, but saving the world will also require something very much like free-market globalism

iss conference.Right-wing nationalism is the solution that solves nothing. What’s needed instead is a movement that doesn’t just succeed in outraging voters, but actually seeks to use government to address the source of their outrage.

some members of the American left seem to be pointing to a compromise: a new system of universal guarantees supported by higher taxes and higher peacetime deficits in this context of a capitalist system

For all the hatred directed toward the Davos crowd, there will be no economic growth in the West without policies that promote entrepreneurship and innovation.

any realistic plan to decarbonize the U.S. economy will almost surely require the sort of commercial technological breakthroughs that tend to come from private entrepreneurs tinkering with the products of publicly funded research

And to reduce global emissions, the United States will have to share its eco-technology with China, southeastern Asian countries, and African nations, which account for most of the growth in future emissions

Globalization and poor governance created the conditions in which nativist insurgencies can grow. Social networks made it possible for political cults to organize around outrage.

For years government elites could silence political outsiders by denying them an audience. In the late 20th century, the Democratic and Republican Parties were terrifically effective at marshaling elite power to shape public opinion during the presidential-election process. Voters didn’t select candidates at random; rather, as political scientists like to say, “the parties decided” on the favored candidates and used their power to funnel voters toward these insiders.

That was before the Cambrian explosion of digital media made it impossible for insiders to control their nomination processes

nativist movements are gaining power by opposing the values of openness and empiricism. These nativists have often thrived by arguing that free markets and globalization have impoverished the middle class and destroyed all sense of national identity or sovereignty.

What’s more, taxing the rich to fund universalist programs directly addresses middle-class insecurities caused by global capitalism—unlike, say, building a giant border wall. Free markets without income security have been a recipe for instability. So have socialist policies that stamp out free markets.

But there’s a good reason that commentators tend to lump together Trump, Brexit, and other “populists” and “populist” movements: They’re built to oppose rather than lead, and right now it’s fair to say they’re in a shambles, unable to fulfill their nativist promises. In the U.K., Prime Minister Theresa May’s Brexit deal was voted down in humiliating fashion. In the United States, Trump’s record-breaking government shutdown led not to a wall but to declining poll numbers for the president. Both May and Trump had to cancel their appearances at the Sw

“All this has happened chiefly because countries—from China to India to Ethiopia—have adopted more market-friendly policies,” the CNN host Fareed Zakaria wrote in The Washington Post.

At a conference symbolizing the promise of capitalism, every non-plutocrat is fighting for scraps.

a “builder class”—a brains trust of youngish idealists, which includes Patrick Collison, co-founder of Stripe, a payments firm valued at $74bn, and other (mostly white and male) techies, who are posing questions that go far beyond the usual interests of Silicon Valley’s titans. They include the future of man and machine, the constraints on economic growth, and the nature of government.

They share other similarities. Business provided them with their clout, but doesn’t seem to satisfy their ambition

The number of techno-billionaires in America (Mr Collison included) has more than doubled in a decade.

ome of them, like the Medicis in medieval Florence, are keen to use their money to bankroll the intellectual ferment

The other is Paul Graham, co-founder of Y Combinator, a startup accelerator, whose essays on everything from cities to politics are considered required reading on tech campuses.

Mr Altman puts it more optimistically: “The iPhone and cloud computing enabled a Cambrian explosion of new technology. Some things went right and some went wrong. But one thing that went weirdly right is a lot of people got rich and said ‘OK, now what?’”

A belief that with money and brains they can reboot social progress is the essence of this new mindset, making it resolutely upbeat

The question is: are the rest of them further evidence of the tech industry’s hubristic decadence? Or do they reflect the start of a welcome capacity for renewal?

Two well-known entrepreneurs from that era provided the intellectual seed capital for some of today’s techno nerds.

Mr Thiel, a would-be libertarian philosopher and investor

This cohort of eggheads starts from common ground: frustration with what they see as sluggish progress in the world around them.

Yet the impact could ultimately be positive. Frustrations with a sluggish society have encouraged them to put their money and brains to work on problems from science funding and the redistribution of wealth to entirely new universities. Their exaltation of science may encourage a greater focus on hard tech

the rationalist movement has hit the mainstream. The result is a fascination with big ideas that its advocates believe goes beyond simply rose-tinted tech utopianism

A burgeoning example of this is “progress studies”, a movement that Mr Collison and Tyler Cowen, an economist and seer of the tech set, advocated for in an article in the Atlantic in 2019

Progress, they think, is a combination of economic, technological and cultural advancement—and deserves its own field of study

There are other examples of this expansive worldview. In an essay in 2021 Mr Altman set out a vision that he called “Moore’s Law for Everything”, based on similar logic to the semiconductor revolution. In it, he predicted that smart machines, building ever smarter replacements, would in the coming decades outcompete humans for work. This would create phenomenal wealth for some, obliterate wages for others, and require a vast overhaul of taxation and redistribution

His two bets, on OpenAI and nuclear fusion, have become fashionable of late—the former’s chatbot, ChatGPT, is all the rage. He has invested $375m in Helion, a company that aims to build a fusion reactor.

Mr Lonsdale, who shares a libertarian streak with Mr Thiel, has focused attention on trying to fix the shortcomings of society and government. In an essay this year called “In Defence of Us”, he argues against “historical nihilism”, or an excessive focus on the failures of the West.

With a soft spot for Roman philosophy, he has created the Cicero Institute in Austin that aims to inject free-market principles such as competition and transparency into public policy.

He is also bringing the startup culture to academia, backing a new place of learning called the University of Austin, which emphasises free speech.

All three have business ties to their mentors. As a teen, Mr Altman was part of the first cohort of founders in Mr Graham’s Y Combinator, which went on to back successes such as Airbnb and Dropbox. In 2014 he replaced him as its president, and for a while counted Mr Thiel as a partner (Mr Altman keeps an original manuscript of Mr Thiel’s book “Zero to One” in his library). Mr Thiel was also an early backer of Stripe, founded by Mr Collison and his brother, John. Mr Graham saw promise in Patrick Collison while the latter was still at school. He was soon invited to join Y Combinator. Mr Graham remains a fan: “If you dropped Patrick on a desert island, he would figure out how to reproduce the Industrial Revolution,”

While at university, Mr Lonsdale edited the Stanford Review, a contrarian publication co-founded by Mr Thiel. He went on to work for his mentor and the two men eventually helped found Palantir. He still calls Mr Thiel “a genius”—though he claims these days to be less “cynical” than his guru.

“The tech industry has always told these grand stories about itself,” says Adrian Daub of Stanford University and author of the book, “What Tech Calls Thinking”. Mr Daub sees it as a way of convincing recruits and investors to bet on their risky projects. “It’s incredibly convenient for their business models.”

In the 2000s Mr Thiel supported the emergence of a small community of online bloggers, self-named the “rationalists”, who were focused on removing cognitive biases from thinking (Mr Thiel has since distanced himself). That intellectual heritage dates even further back, to “cypherpunks”, who noodled about cryptography, as well as “extropians”, who believed in improving the human condition through life extensions

Silicon Valley has shown an uncanny ability to reinvent itself in the past.