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They coexisted in Europe for thousands of years, apparently trading tools and sharing cultures. Some groups survived the Ice Age, while others vanished,

when farmers arrived in Europe about 8,000 years ago, they encountered the descendants of this long history, with light-skinned, dark-eyed people to the east, and possibly dark-skinned and blue-eyed people to the west.

“We lack still an understanding of why these movements were triggered. What happened here, why it happened — it’s strange.”

Modern humans arose in Africa and expanded to other continents about 60,000 years ago

These early Europeans have almost no genetic link to younger remains of hunter-gatherers. It appears that the first modern humans in Europe may have disappeared along with the Neanderthals

he oldest DNA of modern humans in Europe, dating back 45,000 years, undermines such a simple story. It comes from people who belonged to a lost branch of the human family tree. Their ancestors were part of the expansion out of Africa, but they split off on their own before the ancestors of living Europeans and Asians split apart.

About 33,000 years ago, as the climate turned cold, a new culture called the Gravettian arose across Europe. Gravettian hunters made spears to kill woolly mammoths and other big game. They also made so-called Venus figurines that might have represented fertility.

When the glaciers retreated, some descendants of the Fournol continued living in Iberia. But others expanded north as a new population, which Dr. Posth and his colleagues called GoyetQ2. “It really seems like a peopling of Europe after the last glacial maximum,

Dr. Posth and his colleagues found DNA in Gravettian remains scattered across Europe. The scientists had expected all of the individuals to have come from the same genetic population, but instead found two distinct groups: one in France and Spain, and another in Italy, the Czech Republic and Germany.

“They were very distinct, and this was a very big surprise to us because they practiced the same archaeological culture,”

Dr. Posth and his colleagues named the western population the Fournol people, and found a genetic link between this group and 35,000-year-old Aurignacian remains in Belgium.

They called the eastern group Vestonice, and discovered that they share an ancestry with 34,000-year-old hunter-gatherers who lived in Russia.

That genetic gulf led Dr. Posth and his colleagues to argue that the Fournol and Vestonice belonged to two waves that migrated into Europe separately. After they arrived, they lived for several thousand years sharing the Gravettian culture but remaining genetically distinct.

It’s clear from the new study that they were not isolated entirely from each other. In Belgium, the scientists found 30,000-year-old remains with a mix of Fournol and Vestonice ancestry.

About 26,000 years ago, the two groups faced a new threat to their survival: an advancing wall of glaciers. During the Ice Age, from 26,000 to 19,000 years ago, European hunter-gatherers were shut out of much of the continent, surviving only in southern refuges.

the refuge of the Iberian Peninsula, the region now occupied by Spain and Portugal, by studying DNA in the teeth of a 23,000-year-old man found in a cave in southern Spain. His DNA revealed that he belonged to the Fournol people who lived in Iberia before the Ice Age. The researchers also found genetic markers linking him to a 45,000-year-old skeleton discovered in Bulgaria.

When these groups arrived in Europe, Neanderthals had already been living across the continent for more than 100,000 years. The Neanderthals disappeared about 40,000 years ago, perhaps because modern humans outcompeted them with superior tools.

The Vestonice, by contrast, did not survive the Ice Age. When the glaciers were at their most expansive, the Vestonice may have endured for a time in Italy. But Dr. Posth and his colleagues found no Vestonice ancestry in Europeans after the Ice Age. Instead, they discovered a population of hunter-gatherers that appeared to have expanded from the Balkans, known as the Villabruna. They moved into Italy and replaced the Vestonice.

For several thousand years, the Villabruna were limited to southern Europe. Then, 14,000 years ago, they crossed the Alps and encountered the GoyetQ2 people to the north. A new population emerged, its ancestry three parts Villabruna to one part GoyetQ2.

This new people, which Dr. Posth and his colleagues called Oberkassel, expanded across much of Europe, replacing the old GoyetQ2 population.

another climate shift could explain this new wave. About 14,000 years ago, a pulse of strong warming produced forests across much of Europe. The Oberkassel people may have been better at hunting in forests, whereas the GoyetQ2 retreated with the shrinking steppes.

To the east, the Oberkassel ran into a new group of hunter-gatherers, who probably arrived from Russia. The scientists named this group’s descendants, who lived in Ukraine and surrounding regions, the Sidelkino.

in Iberia, there were no great sweeps of newcomers replacing older peoples. The Iberians after the Ice Age still carried a great deal of ancestry from the Fournol people who had arrived there thousands of years before the glaciers advanced. The Villabruna people moved into northern Spain, but added their DNA to the mix rather than replacing those who were there before.

When the first farmers arrived in Europe from Turkey about 8,000 years ago, three large groups of hunter-gatherers thrived across Europe: the Iberians, the Oberkassel and the Sidelkino. Living Europeans carry some of their gene

The Sidelkino people in the east had genes associated with dark eyes and light skin. The Oberkassel in the west, in contrast, probably had blue eyes and may have had dark skin

These three groups of hunter-gatherers remained isolated from each other for about 6,000 years, until the farmers from Turkey arrived. After this advent of agriculture, the three groups began mixing, the scientists found. It’s possible that the spread of farmland forced them to move to the margins of Europe to survive. But over time, they were absorbed into the agricultural communities that surrounded them.

every continent will likely have its own history of hunter-gatherer migrations.

it is now possible to extract human DNA from cave sediments rather than searching for bones and teeth.

President Vladimir V. Putin of Russia, who started his career as a K.G.B. agent in Communist East Germany, took the opposite tack: He made Germany, Europe’s biggest economy, a priority target.

The only hints of potential motives are his apparent far-right sympathies. A search of his home and offices, two people familiar with the investigation said, found fliers from the far-right AfD party. At work, Mr. Linke had openly told colleagues he felt the country was deteriorating, and he was particularly disdainful of its new center-left government, one of those following the inquiry said.

Over the years, far-right groups have grown increasingly sympathetic to Russia, enamored of Mr. Putin’s nationalistic rhetoric. Germany has struggled to root out far-right sympathizers in its security services, including in the military, even dismantling part of its special forces.

A Google account of his, using the alias “Steen von Ottendorf,” first found by Germany’s Der Spiegel newsmagazine, has one YouTube subscription: a channel that collects nationalist tunes. The channel’s icon bears an eagle — and the red, white and black of Germany’s old imperial colors, often used by the far right.

“It’s a kind of conviction, wanting to cooperate with Russia — it’s a romantic belief,” the official said. “I worry there are many others who hold that conviction in our security services.”

Since the days of the Cold War, Germany’s intelligence agency suffered from Russian infiltration, said Erich Schmidt-Eenboom, a historian who has written several books on the agency and keeps a list of all of the B.N.D. agents who were “turned,” exposing hundreds of operatives.

Among them was the 1961 case of Heinz Felfe, a K.G.B. mole who revealed B.N.D. operations across Europe. After the fall of the Soviet Union, Germany learned that a top director, Gabriele Gast, who worked closely with the chancellery, spied for the Stasi, the East German secret police, for 17 years.

According to Mr. Schmidt-Eenboom, the information available to Mr. Linke was vast: internet espionage, German surveillance stations, mobile listening devices in southern Ukraine, and the German Navy’s reconnaissance ships observing the war from the Baltic Sea.

On top of that, Mr. Linke would have had access to reports from allied American services like the C.I.A. and the National Security Agency, as well as from Britain’s Government Communications Headquarters.

Mr. Xi’s statement with Mr. Putin on Feb. 4 endorsed a Russian security proposal that would exclude Ukraine from joining the North Atlantic Treaty Organization.

“He’s damned if he did know, and damned if he didn’t,” Paul Haenle, a former director for China on the National Security Council, said of whether Mr. Xi had been aware of Russia’s plans to invade. “If he did know and he didn’t tell people, he’s complicit; if he wasn’t told by Putin, it’s an affront.”

In any case, the invasion evidently surprised many in Beijing’s establishment

The implications for China extend beyond Ukraine, and even Europe.

Even so, as Mr. Putin became determined to reverse Ukraine’s turn to Western security protections, Chinese officials began to echo Russian arguments. Beijing also saw a growing threat from American-led military blocs.

“Putin may have done this anyway, but also it was unquestionably an enabling backdrop that was provided by the joint statement, the visit and Xi’s association with all of these things,”

Before and shortly after the invasion, Beijing sounded sympathetic to Moscow’s security demands, mocking Western warnings of war and accusing the United States of goading Russia. Over the past two weeks, though, China has sought to edge slightly away from Russia. It has softened its tone, expressing grief over civilian casualties. It has cast itself as an impartial party, calling for peace talks and for the war to stop as soon as possible.

For decades it sought to build ties with Russia while also keeping Ukraine close.

Over the past years, as growing numbers of Ukrainians supported joining NATO, Chinese diplomats did not raise objections with Kyiv, said Sergiy Gerasymchuk, an analyst with Ukrainian Prism, a foreign policy research organization in Kyiv.

For both leaders, their partnership was an answer to Mr. Biden’s effort to forge an “alliance of democracies.”

“He owns that relationship with Putin,” Mr. Haenle said. “If you’re suggesting in the Chinese system right now that it was not smart to get that close to Russia, you’re in effect criticizing the leader.”

Beijing had its own complaints with NATO, rooted in the bombing of the Chinese Embassy in Belgrade, Serbia, during NATO’s war in 1999 to protect a breakaway region, Kosovo. Those suspicions deepened when NATO in 2021 began to describe China as an emerging challenge to the alliance.

n Feb. 23, a foreign ministry spokeswoman, Hua Chunying, accused Washington of “manufacturing panic.”

Chinese officials tweaked their calls to heed Russia’s security, stressing that “any country’s legitimate security concerns should be respected.” They still did not use the word “invasion,” but have acknowledged a “conflict between Ukraine and Russia.”

“Many decision makers in China began to perceive relations in black and white: either you are a Chinese ally or an American one,”

“They still want to remain sort of neutral, but they bitterly failed.”

On the picture’s reverse side, Robert scribbled, “The first light Picture ever taken. 1839.”

Of course, Robert wasn’t smiling in his picture. It perhaps inspired a trend, and few people showed a grin in their photographs over the decades that followed. From portraits and family photos to wedding pictures, even the most joyous occasions were recorded with somber expressions. For the most part, anyway. 

What reasons could people possibly have to record their misery for future generations to gaze upon? 

One possibility for people looking grim is for the simple reason that they felt that way. The photography process scared them. But what could they possibly have to fear? Well, bear in mind that most people had probably never seen anything as technologically advanced as a photograph before. The whole process was probably terrifying... 

Photography was still in its infancy, and the science talk did nothing to introduce it to a wider audience. Take the rooms for example, which photographers called “operation rooms.” Sounds a bit too similar to surgery, doesn’t it? And they referred to the equipment as “instruments,” which has more scientific connotations. We’re not sure people were exactly put at ease, is the point.

So the poor photography subjects perhaps didn’t know if they were going to get immortalized or atomized. They could’ve been in the dark about whether it would hurt or not. And what if they were literal subjects and even the photographers didn’t know what would happen? It was all a very worrying time for the models. 

Before there was photography, painting was the most effective medium for capturing a person’s likeness. And as long as early cameras took to take a picture, painting one took even longer. So for the same reasons, smiles were a no-no. It’s the reason Leonardo da Vinci’s Mona Lisa portrait is so debated. 

The model — one Elmer Ellsworth Masterman — asked, “What is the difference between posing for a photograph and posing for a painting?” It seems the commonality was ingrained into society. And if you couldn’t smile for art, photographs were no different. Plus, who was the common man or woman to argue with Jesus? Maybe we’re having fun with that last sentence

if we are agreed that Beijing looks set to stop the largest property boom in history without unleashing a systemic financial crisis, it is doing something truly remarkable. It is setting a new standard in economic policy.

Is this perhaps what policy looks like if it actually takes financial stability seriously? And if we look in the mirror, why aren’t we applauding more loudly?

Add to real estate the other domestic factor roiling the Chinese financial markets: Beijing’s remarkable humbling of China’s platform businesses, the second-largest cluster of big tech in the world. That too is without equivalent anywhere else.

Beijing’s aim is to ensure that gambling on big tech no longer produces monopolistic rents. Again, as a long-term policy aim, can one really disagree with that?

we have two dramatic and deliberate policy-induced shocks of the type for which there is no precedent in the West. Both inflict short-term pain with a view to longer-term social, economic and financial stability.

Ultimately political economy determines the conditions for long-run growth. So if you had to bet on a regime, which might actually have what it takes to break a political economy impasse, to humble vested interests and make a “big play” on structural change, which would it be? The United States, the EU or Xi’s China?

Beijing’s challenge right now is to manage the fall out from the two most dramatic development policies the world has ever seen, the one-child policy and China’s urbanisation, plus the historic challenge of big tech — less a problem specific to China than the local manifestation of what Shoshana Zuboff calls “surveillance capitalism”.

no, Xi’s regime has not yet presented a fully convincing substitute plan. But, as Michael Pettis has forcefully argued, China has options. There is an entire range of policies that Beijing could put in place to substitute for the debt-fuelled infrastructure and housing boom.

demography is normally treated as a natural parameter for economic activity. But in China’s case the astonishing fact is that the sudden ageing of its workforce is also a policy-induced challenge. It is a legacy of the one-child policy — the most gigantic and coercive intervention in human reproduction ever undertaken.

China needs to spend heavily on renewable energy and power distribution to break its dependence on coal. If it needs more housing, it should be affordable. All of this would generate more balanced growth. 5 per cent? Perhaps not, but certainly healthier and more sustainable.

If it has not so far pursued an alternative growth model in a more determined fashion, some of the blame no doubt falls on the prejudices of the Beijing policy elite. But even more significant are surely the entrenched interests of the infrastructure-construction-local government-credit machine, in other words the kind of political economy factors that generally inhibit the implementation of good policy.

The problem is only too familiar in the West. In Europe and the US too, such interest group combinations hobble the search for new growth models. In the United States they put in doubt the possibility of the energy transition, the possibility of providing a healthcare system that is fit for purpose and any initiative on trade policy that involves widening market access.

First and foremost China needs a welfare state befitting of its economic development.

On balance, if you want to be part of history-making economic transformation, China is still the place to be. But it is undeniably shifting gear. And thanks to developments both inside and outside the country, investors will have to reckon with a much more complex picture of opportunity and risk. You are going to need to pick smart and follow the politics and geopolitics closely.

If on the other hand you want to invest in the green energy transition — the one big vision of economic development that the world has come up with right now — you simply have to have exposure to China, whether directly or indirectly by way of suppliers to China’s green energy sector. China is where the grand battle over the future of the climate is going to be fought. It will be a huge driver of innovation, capital accumulation and profit, the influence of which will be felt around the world.

it is one key area that both the Biden administration and the EU would like to “silo off” from other areas of conflict with China.

I worry that we may be too focused on the medium-term. Given the news out of Hong Kong and mainland China, Covid may yet come back to bite us.

Here too China is boxed in by its own success. It has successfully pursued a no-Covid policy, but due to the failing of the rest of the world, it has been left to do so in “one country”.

Until China finds some way to contain the risks, this is a story to watch. A dramatic Omicron surge across China would upend the entire narrative of the last two years, which is framed by Beijing success in containing the first wave.

On Thursday, rescuers said they had found engine components, part of a wing and other “important debris” as they searched the mountainside in a rural part of the Guangxi region for a fourth day.

Mr. Zhang, who was born in 1963, was one of China’s most experienced pilots,

A day earlier, the workers had found a black box, believed to be the cockpit voice recorder, which could provide investigators with crucial details. Officials said it was damaged but that its memory unit was relatively intact. The plane’s second black box, which records flight data, has yet to be recovered.

Their past performance was “very good,” Sun Shiying, the chairman of China Eastern Airlines’ Yunnan branch, said on Wednesday. When reached by phone, an airline representative declined to answer further questions about the crew.

At the main crash site, a state broadcaster showed the workers digging with shovels around a large piece of wreckage that the reporter described as a wing, which bore part of the China Eastern logo and was perched on a steep, barren slope fringed by dense thickets of now-flattened bamboo. Heavy rains had left the roads slick and inundated the earth with muddy pools.

Over his career as a commercial pilot with China Yunnan, which later merged with China Eastern, Mr. Zhang flew four different models of aircraft and accumulated 31,769 hours of flight experience.

The airline commonly paired young pilots with older pilots, and Mr. Zhang had mentored more than 100, CAAC News said. Mr. Yang was one of them.

Experts said that investigating the crash, which involved a sudden dive from cruising altitude in good weather, would require a close look at both the aircraft and the pilots, including the possibility that the plane was deliberately brought down. But they stressed that the cause was far from determined.

“Certainly an intentional downing is always a part of any investigation, and especially with this particular flight profile,” said Hassan Shahidi, chief executive of the Flight Safety Foundation, a nonprofit organization created after World War II to promote aviation safety. But he cautioned that it was “premature to jump onto any possibilities.”

“If the captain were intending to commit suicide, they’d have to overcome the other flight crew members,” Mr. Marks said.

Telegram videos and more. Ukrainian entrepreneurs are even hijacking their own apps to let Russians know what’s going on. While such efforts have mixed success, they demonstrate the ingenuity needed to win the information battle that’s as old as war itself.

Meanwhile, an organization called Squad303 built an online tool that lets people automatically send Russians texts, WhatsApp messages and emails. Some of the most effective strategies rely on old-school technologies. The use of virtual private networks, or VPNs, has skyrocketed in Russia since the war began. That may explain why the country’s telecom regulator has forced Google to delist thousands of URLs linked to VPN sites.

For Paulius Senūta, an advertising executive in Lithuania, the weapon of choice is the telephone. He recently launched “CallRussia,” a website that enables Russian speakers to cold-call random Russians based on a directory of 40 million phone numbers. Visitors to the site get a phone number along with a basic script developed by psychologists that advises callers to share their Russian connections and volunteer status before encouraging targets to hear what’s really going on. Suggested lines include “The only thing (Putin) seems to fear is information,” which then lets callers stress the need to put it “in the hands of Russians who know the truth and stand up to stop this war.” In its first eight days, Senūta says users from eastern Europe and elsewhere around the world placed nearly 100,000 calls to strangers in Russia.

“One thing is to call them and the other thing is how to talk with them,” says Senūta. As with any telemarketing call, the response from those on the receiving end has been mixed. While some have been receptive, others are angry at the interruption or suspicious that it’s a trick. “How do you speak to someone who has been in a different media environment?”

Terms like “war,” “invasion,” or “aggression” have been banned from coverage, punishable by fines of up to five million rubles (now roughly $52,000) or 15 years in prison. Says Kozlovsky: “It’s getting worse and worse.”

Arnold Schwarzenegger uploaded a lengthy video message to Russians via Telegram that included both Russian and English subtitles.) However, that it doesn’t mean it hurts to also try new things.

The question is whether Russians realize they’re being fed on a media diet of state-sponsored lies and criminalization of the truth. Dittmer believes many Russians are eager to know what’s really going on. So far, RSF’s “Truth Wins” campaign has been viewed more than 150,000 times in Russia. (Previous efforts by DDB and RSF in various countries have included embedding censored news in a virtual library within Minecraft and a playlist on Spotify.)

Censorship also cuts both ways. While Russian authorities have banned Facebook and Instagram as “extremist,” Western news outlets have in turn cut ties with state-controlled outlets because of Putin’s disinformation campaign. While pulling products and partnerships out of Russia may send a powerful message to the Kremlin, such isolation also risks leaving a bubble of disinformation intact. Luckily, “it’s pretty much impossible to censor effectively,” says RSF’s Dittmer, pointing to further efforts to use blockchain and gaming technology to spread news. “We can play the cat and mouse game with the internet censors in a slightly more sophisticated way.”

As I wrote in my book, at my most partisan moment I once gave a speech in which I said words that shame me to this day. 

we forget a fundamental truth—our own maladies often make us unable to see the world clearly. Or, as Jesus said, “You hypocrite, first take the plank out of your own eye, and then you will see clearly to remove the speck from your brother’s eye.” In so many ways, we’ve become the People of the Plank, blind to the pain we’ve inflicted on the public even as we try desperately to protect ourselves from them.

Early church fathers were far, far more concerned with the faith and virtue of the church than the maladies of the Romans. 

“I believe the two greatest threats to the United States are university leftists at home and jihadists abroad.”

In Iraq, the reality was so profoundly different that words can barely begin to describe all the distinctions

I didn’t exactly become post-partisan upon my return (that came later), but I gained the perspective that permitted me to start the process of pulling the plank from my own eye.

it’s opened my eyes to many truths that were new to me. Among them, the church should be focused much more on its own virtue than the virtue of the rest of the world.

In addition, if there were no grounds for Christians to live with a “spirit of fear” at the height of the Roman Empire, there are no grounds for us to live with a spirit of fear in our nation today. Yet fear seems to dominate Christian political activism—including fear of the left, of CRT, and sometimes even fear for the very existence of a free church in the United States of America.

sad experience with Christian leaders teaches us that their professed identity tells us little to nothing about their actual virtue, and virtue should be the guiding concern of Christians in politics, not identity. 

I now see that my young desire for “more Christians in politics” and “more respect for Christians in public life” was part of the plank in my eye. Indeed, it helped make me gullible and tribal.

I was often eager to critique secular cultures and slow to respond when my own narratives came under credible attack. 

While some of the most important fights for justice have been led by Christians—including the civil rights and pro-life movements—some of the most destructive political and cultural forces have been loudly and proudly led by Christians as well. 

In fact, two of the most destructive political and cultural movements of this new century—vaccine refusal that has cost hundreds of thousands of lives, and an effort to overturn an election that could have ruptured our republic—were disproportionately dominated by the most outspoken Christian voices.

Here’s what’s hard. Refusing to lie for a president. Refusing to yield to a mob. Resisting the fury of a furious time. And if Christians can’t succeed in that most basic, though often profoundly dangerous, task, then no, we don’t need more Christians in politics. We need more people who possess and demonstrate character and moral courage.

titled “Tightness-Looseness Across the 50 United States,” the study calculated a catalog of measures for each state, including the incidence of natural disasters, disease prevalence, residents’ levels of openness and conscientiousness, drug and alcohol use, homelessness and incarceration rates.

Gelfand said:Some groups have much stronger norms than others; they’re tight. Others have much weaker norms; they’re loose. Of course, all cultures have areas in which they are tight and loose — but cultures vary in the degree to which they emphasize norms and compliance with them.

states in New England and on the West Coast were the loosest: California, Oregon, Washington, Maine, Massachusetts, Connecticut, New Hampshire and Vermont.

In both 2016 and 2020, Donald Trump carried all 10 of the top “tight” states; Hillary Clinton and Joe Biden carried all 10 of the top “loose” states.

“Rule Makers, Rule Breakers: How Tight and Loose Cultures Wire the World” in 2018, in which she described the results of a 2016 pre-election survey she and two colleagues had commissioned

The results were telling: People who felt the country was facing greater threats desired greater tightness. This desire, in turn, correctly predicted their support for Trump. In fact, desired tightness predicted support for Trump far better than other measures. For example, a desire for tightness predicted a vote for Trump with 44 times more accuracy than other popular measures of authoritarianism.

The 2016 election, Gelfand continued, “turned largely on primal cultural reflexes — ones that had been conditioned not only by cultural forces, but by a candidate who was able to exploit them.”

Along the same lines, if liberals and conservatives hold differing moral visions, not just about what makes a good government but about what makes a good life, what turned the relationship between left and right from competitive to mutually destructive?

Cultural differences, Gelfand continued, “have a certain logic — a rationale that makes good sense,” noting that “cultures that have threats need rules to coordinate to survive (think about how incredibly coordinated Japan is in response to natural disasters).

cultures that don’t have a lot of threat can afford to be more permissive and loose.”

The tight-loose concept, Gelfand argued,is an important framework to understand the rise of President Donald Trump and other leaders in Poland, Hungary, Italy, and France,

The gist is this: when people perceive threat — whether real or imagined, they want strong rules and autocratic leaders to help them survive

My research has found that within minutes of exposing study participants to false information about terrorist incidents, overpopulation, pathogen outbreaks and natural disasters, their minds tightened. They wanted stronger rules and punishments.

The South dominated the tight states: Mississippi, Alabama Arkansas, Oklahoma, Tennessee, Texas, Louisiana, Kentucky, South Carolina and North Carolina

Looseness, Gelfand posits, fosters tolerance, creativity and adaptability, along with such liabilities as social disorder, a lack of coordination and impulsive behavior.

If liberalism and conservatism have historically played a complementary role, each checking the other to constrain extremism, why are the left and right so destructively hostile to each other now, and why is the contemporary political system so polarized?

Gelfand writes that tightness encourages conscientiousness, social order and self-control on the plus side, along with close-mindedness, conventional thinking and cultural inertia on the minus side.

Niemi contended that sensitivity to various types of threat is a key factor in driving differences between the far left and far right.

She cited research thatfound 47 percent of the most extreme conservatives strongly endorsed the view that “The world is becoming a more and more dangerous place,” compared to 19 percent of the most extreme liberals

Conservatives and liberals, Niemi continued,see different things as threats — the nature of the threat and how it happens to stir one’s moral values (and their associated emotions) is a better clue to why liberals and conservatives react differently.

Unlike liberals, conservatives strongly endorse the binding moral values aimed at protecting groups and relationships. They judge transgressions involving personal and national betrayal, disobedience to authority, and disgusting or impure acts such as sexually or spiritually unchaste behavior as morally relevant and wrong.

Underlying these differences are competing sets of liberal and conservative moral priorities, with liberals placing more stress than conservatives on caring, kindness, fairness and rights — known among scholars as “individualizing values

conservatives focus more on loyalty, hierarchy, deference to authority, sanctity and a higher standard of disgust, known as “binding values.”

As a set, Niemi wrote, conservative binding values encompassthe values oriented around group preservation, are associated with judgments, decisions, and interpersonal orientations that sacrifice the welfare of individuals

Just as ecological factors differing from region to region over the globe produced different cultural values, ecological factors differed throughout the U.S. historically and today, producing our regional and state-level dimensions of culture and political patterns.

Niemi cited a paper she and Liane Young, a professor of psychology at Boston College, published in 2016, “When and Why We See Victims as Responsible: The Impact of Ideology on Attitudes Toward Victims,” which tested responses of men and women to descriptions of crimes including sexual assaults and robberies.

We measured moral values associated with unconditionally prohibiting harm (“individualizing values”) versus moral values associated with prohibiting behavior that destabilizes groups and relationships (“binding values”: loyalty, obedience to authority, and purity)

Increased endorsement of binding values predicted increased ratings of victims as contaminated, increased blame and responsibility attributed to victims, increased perceptions of victims’ (versus perpetrators’) behaviors as contributing to the outcome, and decreased focus on perpetrators.

For example, binding values are associated with Machiavellianism (e.g., status-seeking and lying, getting ahead by any means, 2013); victim derogation, blame, and beliefs that victims were causal contributors for a variety of harmful acts (2016, 2020); and a tendency to excuse transgressions of ingroup members with attributions to the situation rather than the person (2023).

What happened to people ecologically affected social-political developments, including the content of the rules people made and how they enforced them

Numerous factors potentially influence the evolution of liberalism and conservatism and other social-cultural differences, including geography, topography, catastrophic events, and subsistence styles

Joshua Hartshorne, who is also a professor of psychology at Boston College, took issue with the binding versus individualizing values theory as an explanation for the tendency of conservatives to blame victims:

I would guess that the reason conservatives are more likely to blame the victim has less to do with binding values and more to do with the just-world bias (the belief that good things happen to good people and bad things happen to bad people, therefore if a bad thing happened to you, you must be a bad person).

Belief in a just world, Hartshorne argued, is crucial for those seeking to protect the status quo:It seems psychologically necessary for anyone who wants to advocate for keeping things the way they are that the haves should keep on having, and the have-nots have got as much as they deserve. I don’t see how you could advocate for such a position while simultaneously viewing yourself as moral (and almost everyone believes that they themselves are moral) without also believing in the just world

Conversely, if you generally believe the world is not just, and you view yourself as a moral person, then you are likely to feel like you have an obligation to change things.

I asked Lene Aaroe, a political scientist at Aarhus University in Denmark, why the contemporary American political system is as polarized as it is now, given that the liberal-conservative schism is longstanding. What has happened to produce such intense hostility between left and right?

There is variation across countries in hostility between left and right. The United States is a particularly polarized case which calls for a contextual explanatio

A central explanation typically offered for the current situation in American politics is that partisanship and political ideology have developed into strong social identities where the mass public is increasingly sorted — along social, partisan, and ideological lines.

I then asked Aaroe why surveys find that conservatives are happier than liberals. “Some research,” she replied, “suggests that experiences of inequality constitute a larger psychological burden to liberals because it is more difficult for liberals to rationalize inequality as a phenomenon with positive consequences.”

Steven Pinker, a professor of psychology at Harvard, elaborated in an email on the link between conservatism and happiness:

t’s a combination of factors. Conservatives are likelier to be married, patriotic, and religious, all of which make people happier

They may be less aggrieved by the status quo, whereas liberals take on society’s problems as part of their own personal burdens. Liberals also place politics closer to their identity and striving for meaning and purpose, which is a recipe for frustration.

Some features of the woke faction of liberalism may make people unhappier: as Jon Haidt and Greg Lukianoff have suggested, wokeism is Cognitive Behavioral Therapy in reverse, urging upon people maladaptive mental habits such as catastrophizing, feeling like a victim of forces beyond one’s control, prioritizing emotions of hurt and anger over rational analysis, and dividing the world into allies and villains.

Why, I asked Pinker, would liberals and conservatives react differently — often very differently — to messages that highlight threat?

It may be liberals (or at least the social-justice wing) who are more sensitive to threats, such as white supremacy, climate change, and patriarchy; who may be likelier to moralize, seeing racism and transphobia in messages that others perceive as neutral; and being likelier to surrender to emotions like “harm” and “hurt.”

The authors used neural imaging to follow changes in the dorsomedial prefrontal cortex (known as DMPFC) as conservatives and liberals watched videos presenting strong positions, left and right, on immigration.

there are ways to persuade conservatives to support liberal initiatives and to persuade liberals to back conservative proposals:

While liberals tend to be more concerned with protecting vulnerable groups from harm and more concerned with equality and social justice than conservatives, conservatives tend to be more concerned with moral issues like group loyalty, respect for authority, purity and religious sanctity than liberals are. Because of these different moral commitments, we find that liberals and conservatives can be persuaded by quite different moral arguments

For example, we find that conservatives are more persuaded by a same-sex marriage appeal articulated in terms of group loyalty and patriotism, rather than equality and social justice.

“political arguments reframed to appeal to the moral values of those holding the opposing political position are typically more effective

We find support for these claims across six studies involving diverse political issues, including same-sex marriage, universal health care, military spending, and adopting English as the nation’s official language.”

In one test of persuadability on the right, Feinberg and Willer assigned some conservatives to read an editorial supporting universal health care as a matter of “fairness (health coverage is a basic human right)” or to read an editorial supporting health care as a matter of “purity (uninsured people means more unclean, infected, and diseased Americans).”

Conservatives who read the purity argument were much more supportive of health care than those who read the fairness case.

Liberals who read the fairness argument were substantially more supportive of military spending than those who read the loyalty and authority argument.

In “Conservative and Liberal Attitudes Drive Polarized Neural Responses to Political Content,” Willer, Yuan Chang Leong of the University of Chicago, Janice Chen of Johns Hopkins and Jamil Zaki of Stanford address the question of how partisan biases are encoded in the brain:

society. How do such biases arise in the brain? We measured the neural activity of participants watching videos related to immigration policy. Despite watching the same videos, conservative and liberal participants exhibited divergent neural responses. This “neural polarization” between groups occurred in a brain area associated with the interpretation of narrative content and intensified in response to language associated with risk, emotion, and morality. Furthermore, polarized neural responses predicted attitude change in response to the videos.

The four authors argue that their “findings suggest that biased processing in the brain drives divergent interpretations of political information and subsequent attitude polarization.” These results, they continue, “shed light on the psychological and neural underpinnings of how identical information is interpreted differently by conservatives and liberals.”

While liberals and conservatives, guided by different sets of moral values, may make agreement on specific policies difficult, that does not necessarily preclude consensus.

or each video,” they write,participants with DMPFC activity time courses more similar to that of conservative-leaning participants became more likely to support the conservative positio

Conversely, those with DMPFC activity time courses more similar to that of liberal-leaning participants became more likely to support the liberal position. These results suggest that divergent interpretations of the same information are associated with increased attitude polarizatio

Together, our findings describe a neural basis for partisan biases in processing political information and their effects on attitude change.

Describing their neuroimaging method, the authors point out that theysearched for evidence of “neural polarization” activity in the brain that diverges between people who hold liberal versus conservative political attitudes. Neural polarization was observed in the dorsomedial prefrontal cortex (DMPFC), a brain region associated with the interpretation of narrative content.

The question is whether the political polarization that we are witnessing now proves to be a core, encoded aspect of the human mind, difficult to overcome — as Leong, Chen, Zaki and Willer sugges

— or whether, with our increased knowledge of the neural basis of partisan and other biases, we will find more effective ways to manage these most dangerous of human predispositions.

For decades — and particularly since the 2008 recession — politicians in both parties have mounted a strident campaign against government funding for the liberal arts. They express a growing disdain for any courses not explicitly tailored to the job market and outright contempt for the role the liberal arts-focused university has played in American society.

Former Gov. Scott Walker’s assault on higher education in Wisconsin formed the bedrock of many later conservative attacks. His work severely undermined a state university system that was once globally admired. Mr. Walker reportedly attempted to cut phrases like “the search for truth” and “public service” — as well as a call to improve “the human condition” — from the University of Wisconsin’s official mission statement

But blue states also regularly cut higher education funding, sometimes with similar rationales. In 2016, Matt Bevin, the Republican governor of Kentucky at the time, suggested that students majoring in the humanities shouldn’t receive state funding. The current secretary of education, Miguel Cardona, a Democrat, seems to barely disagree. “Every student should have access to an education that aligns with industry demands and evolves to meet the demands of tomorrow’s global work force,” he wrote in December.

Federal funding reflects those priorities. The National Endowment for the Humanities’ budget in 2022 was just $180 million. The National Science Foundation’s budget was about 50 times greater, having nearly doubled within two decades.

What were students meant to think? As the cost of higher education rose, substantially outpacing inflation since 1990, students followed funding — and what politicians repeatedly said about employability — into fields like business and computer science. Even majors in mathematics were hit by the focus on employability.

Universities took note and began culling. One recent study showed that history faculty across 28 Midwestern universities had dropped by almost 30 percent in roughly the past decade. Classics programs, including the only one at a historically Black college, were often simply eliminated.

Higher education, with broad study in the liberal arts, is meant to create not merely good workers but good citizens

this is a grim and narrow view of the purpose of higher education, merely as a tool to train workers as replaceable cogs in America’s economic machine, to generate raw material for its largest companies.

Citizens with knowledge of their history and culture are better equipped to lead and participate in a democratic society; learning in many different forms of knowledge teaches the humility necessary to accept other points of view in a pluralistic and increasingly globalized society.

In 1947, a presidential commission bemoaned an education system where a student “may have gained technical or professional training” while being “only incidentally, if at all, made ready for performing his duties as a man, a parent and a citizen.” The report recommended funding to give as many Americans as possible the sort of education that would “give to the student the values, attitudes, knowledge and skills that will equip him to live rightly and well in a free society,” which is to say the liberal arts as traditionally understood. The funding followed.

The report is true today, too

the American higher education system is returning to what it once was: liberal arts finishing schools for the wealthy and privileged, and vocational training for the rest.

Reversing this decline requires a concerted effort by both government and educational actors

renewed funding for the liberal arts — and especially the humanities — would support beleaguered departments and show students that this study is valuable and valued.

At the university level, instituting general education requirements would guarantee that even students whose majors have nothing to do with the humanities emerged from college equipped to think deeply and critically across disciplines.

Liberal arts professors must also be willing to leave their crumbling ivory towers and the parochial debates about their own career path, in order to engage directly in public life

In May, the European Commission put out a plan for achieving energy independence from Russia that leaned further into the renewable energy transition. Known as REPowerEU, it encourages diversifying fossil fuel sources and accelerating the adoption of renewable energy sources like wind and solar, and also pushes for greater energy savings.

major challenges remain. Solar power, in particular, has supply chain risks of its own. China has a near-monopoly on the raw materials and technical expertise to produce photovoltaic cells for solar panels. An analysis from Bloomberg BNEF found it would take nearly $150 billion for Europe to build the plants to manufacture enough solar capacity and storage to meet demand by 2030.

Achieving energy security and meeting climate goals will take far greater investment and cooperation between European countries than ever before, according to energy experts.

“One of Europe’s founding fathers — Jean Monnet — used to say that Europe would be made out of crisis,” said Simone Tagliapietra, a senior fellow at Bruegel, an energy think tank. “Europe will come out of this energy crisis more united when it comes to energy and climate policy.”

“It’s shoot first, ask questions later,”

Each one of these incidents resulted from unique events. But activists and researchers say they stem from a convergence of bigger factors — increased fear of crime and an attendant surge in gun ownership, increasingly extreme political messaging on firearms, fearmongering in the media and marketing campaigns by the gun industry that portray the suburban front door as a fortified barrier against a violent world.

“The gun lobby markets firearms as something you need to defend yourself — hammers in search of nails,”

The perception that crime, especially violent gun crime, has increased is not a manufactured myth. National murder rates have climbed by about a third since 2019, according to government data, even accounting for modest declines in fatal shootings over the past 18 months.

Gun purchases rose during the pandemic and the unrest and racial-justice protests after the murder of George Floyd. Nearly 20 percent of American households bought a gun from March 2020 to March 2022, and about 5 percent of Americans bought a gun for the first time,

More than 30 states also have “stand your ground” laws. Some have recently strengthened their “castle doctrine” laws, making it more difficult to prosecute homeowners who claim self-defense in a shooting.

“People become paranoid and over-worried — and then comes an unannounced knock on their door,”

But several large-scale studies have suggested that the laws have few benefits, increase the likelihood of gun violence and might discriminate against minority groups, especially Black people.

The effect of self-defense laws protecting homeowners and gun owners is fiercely debated, with proponents arguing that their mere presence deters criminal behavior or civil disorder

shootings in which white people shot Black people were nearly three times as likely to be found “justified” compared with cases where white people shot other white people.

A 2023 analysis of recent academic research by the nonpartisan RAND Corporation found no evidence that such laws had the deterrent effect that their sponsors claimed, and there was some indication, while not conclusive, that the laws might account for some increases in gun violence.

weapons were actually more likely to be used in suicides, discharged accidentally, stolen or brandished in domestic disputes, than used to fend off an external attack.

The National Rifle Association and other gun-rights groups have long disputed such assessments, citing surveys that show far greater use of weapons for legitimate self-defense.

About a third of the roughly 16,700 gun owners surveyed in a study led by William English, a Georgetown University business school professor, said they had used their guns for self-defense, prompting Mr. English to estimate that as many as 1.6 million people in the country had defended themselves with a weapon that year.

Since 2016, there have been two competing visions for the Democratic Party. One is the promise that began with Barack Obama of a multiracial coalition that would grow stronger as America’s demographics shifted; the other is the political revolution championed by Bernie Sanders as a way to unite nonvoters with the working class

Ms. Ocasio-Cortez bridges the gap between the two

what’s clear is that at a time when Democrats are struggling, she is quietly laying the groundwork to build a coalition broader than the one she came to power with, unafraid to take risks along the way.

After five years in Congress, she has emerged as a tested navigator of its byzantine systems, wielding her celebrity to further her political aims in a way few others have.

Three terms in, one gets the sense that we’re witnessing a skilled tactician exiting her political adolescence and coming into her own as a veteran operator out to reform America’s most dysfunctional political body.

To grasp what sets Ms. Ocasio-Cortez apart from many of her colleagues, you have to understand where she finds allies

In 2019, she and Senator Ted Cruz of Texas considered joining forces to write a bill that would bar former members of Congress from becoming lobbyists. Asked why she would consider an alliance with someone so loathed by liberals, she said, “I will swallow all of my distaste in this situation because we have found a common interest.”

It was a window into the politician she would become: pragmatic and results-driven, willing to work with people she considers her political adversaries, at least on legislation that appeals to her base

She has attributed the success of these efforts at least in part to her role as the second most powerful Democrat on the House Oversight Committee, which she said has “opened many windows” for collaboration.

while these bills may seem like small victories, they are more than that because, in a sense, she is redefining what bipartisanship looks like in Washington.

For decades, bipartisanship has meant bringing together moderates, lobbyists and establishment insiders to produce watered-down legislation unpalatable to many voters in both political partie

What Ms. Ocasio-Cortez is doing is different; she’s uniting politicians on the fringes of American politics around a broadly popular set of policies.

Americans in both parties overwhelmingly say that they don’t trust the government to do the right thing and that donors and lobbyists have too much sway over the legislative process.

more than 8 in 10 Americans believe politicians “are more focused on fighting each other than on solving problems.” One-fifth of respondents said lack of bipartisan cooperation was the biggest problem with the political system.

Ms. Ocasio-Cortez’s efforts to reach out to Republicans are offering what a sizable portion of Americans want from Congress: a return to getting things done.

The few policy matters on which progressives and conservatives align often boil down to a distrust of politicians and of big corporations, particularly technology companies and pharmaceutical giants.

Ms. Ocasio-Cortez has shrewdly made those causes her passion, building alliances with conservative colleagues interested in holding these industries accountable.

Last spring, she cosponsored a bill with, among others, Brian Fitzpatrick, a moderate Republican from Pennsylvania, and Matt Gaetz, the Florida rabble-rouser who has become one of Mr. Trump’s most steadfast allies. The legislation would bar members of Congress from trading individual stocks, a measure that as of the fall of 2022 was supported by nearly 70 percent of voters across party lines.

On Gaza, too, she has been willing to buck other members of her party to pursue an agenda that a majority of voters support. She was one of the first Democrats to call for a cease-fire; within weeks, nearly 70 percent of Americans said Israel should call one and try to negotiate with Hamas.

In March, Ms. Ocasio-Cortez was accosted by a handful of protesters who demanded that she call Israel’s war in Gaza a genocide.

Less than three weeks later, Ms. Ocasio-Cortez did accuse Israel of genocide and chastised the White House for providing military aid to the country while it blockaded Gaza. “If you want to know what an unfolding genocide looks like,” Ms. Ocasio-Cortez said in a speech on the House floor, “open your eyes. It looks like the forced famine of 1.1 million innocents. It looks like thousands of children eating grass as their bodies consume themselves, while trucks of food are slowed and halted just miles away.”

Last month, she voted against providing additional funding for Israel. Those were unpopular positions in Congress, where unconditional support for the country remains the norm, but they put her in line with a majority of Democratic voters.

These stances haven’t been enough to quell the doubts from a faction of the left that helped get her elected. Over the past few weeks, some have accused her of caving in to pressure from moderate Democrats

. Ms. Ocasio-Cortez has taken much of the heat from leftist activists who see her as a symbol of the contradictions and compromises inherent in the political system. It may not be realistic to expect absolute purity from her; she is, after all, a politician. But these critiques overlook the promise of what she’s doing behind the scenes.

Democratic pollsters and strategists are searching for ways for Mr. Biden to win back Muslims and Arab Americans in swing states such as Michigan and Georgia, recent college graduates who hoped to have their student debt forgiven, immigrant-rights activists and Latinos.

Some of the betrayal these voters feel was hardly the president’s fault; he was hampered on student loan debt by a federal judiciary stacked with judges sympathetic to conservative legal arguments, and Congress refused to pass the comprehensive immigration bill he supported in 2021, which would have provided legal status to as many as 11 million undocumented immigrants.

A more gifted orator might have been able to make the structural impediments in his way clear to voters, while also putting forth a proactive vision for dismantling the core problems baked into our politics.

In that, someone like Ms. Ocasio-Cortez, who endorsed Mr. Biden for re-election in 2023, may be able to help. She’s the Democratic Party’s most charismatic politician since Barack Obama and its most ardent populist since Bernie Sanders.

she can offer voters something more substantial than a hollow rebuke of Trumpism

Last month, when the journalist Mehdi Hasan asked her how she’d respond to “a young progressive or Arab American who says to you, ‘I just can’t vote for Biden again after what he’s enabled in Gaza,’” Ms. Ocasio-Cortez said a vote for Mr. Biden didn’t necessarily mean an endorsement of all his policies. “Even in places of stark disagreement, I would rather be organizing under the conditions of Biden as an opponent on an issue than Trump,” she said. It was a shrewd political maneuver, designed to distance herself from Democrats who support Israel unconditionally, while meeting voters — some of whom have lost family members in Gaza — where they are

There are, of course, limits to this strategy. Some on the left see Ms. Ocasio-Cortez’s endorsement of Mr. Biden as a betrayal of progressive values, particularly in the wake of the climbing death toll in Gaza.

The moderate Republicans who turned out for Mr. Biden in 2020 might shrink from a Democratic Party led by someone they consider an outspoken progressive.

But for every moderate or leftist voter lost with a strategy like Ms. Ocasio-Cortez’s, the Democratic Party may be able to win someone new — from the pool of disillusioned Americans who feel shut out of the political process.

People might not agree on much, Chandler says, but the “veil of ignorance” encourages us to find a mutually agreeable starting point. If we don’t know what community we are born into, we should want a “reasonable pluralism.” We should also want the state “to maintain the conditions that are the basis for our freedom and equality as citizens.”

As an example, Chandler raises the thorny issue of free speech. “Political, moral and religious” speech “is integral to developing our sense of what is fair and how to live,” he writes, which is why it deserves robust protection. But since some speech, such as advertising, plays “no meaningful role” in helping us figure out how to live a good life, such speech can be limited. The idea is to balance individual and group freedoms with the need for peaceful coexistence

The state should protect the rights of gay people not to be discriminated against — even though the state cannot force anyone or any group to approve of gay relationships. Chandler, who is gay, suggests that premising gay rights on getting everyone to agree on the question of morality is a waste of energy: “For some people this” — the belief that homosexuality is a sin — “is part of their faith and no reasoned argument will persuade them otherwise.”

The last two-thirds of “Free and Equal” are given over to specific policy proposals. Some of them sound familiar enough — restricting private money in politics; beefing up civic education — while others are more far-reaching and radical, including the establishment of worker cooperatives, in which “workers decide how things are done,” and the abolition of private schools.

t despite his valiant efforts, the book enacts both the promise and the limitations of the theory it seeks to promote. It didn’t leave me cold, but it did leave me restless.

He persuasively refutes the conflation of liberal egalitarianism with technocracy, and helpfully points out that an emphasis on technocratic competence “leaves many voters cold.

For anyone who venerates consensus in politics, this sounds appealing; given the fissures of our current moment, it also comes across as wildly insufficient.

that’s part of Chandler’s point: A Rawlsian framework encourages people with a variety of deeply held commitments to live together in mutual tolerance, free to figure out questions of individual morality and the good life for themselves.

Regarding Katrina Forrester’s “In the Shadow of Justice” (2019), a searching and brilliant history of how his ideas presumed a postwar consensus that was already fracturing at the time that “A Theory of Justice” was published, Chandler has little to say.

“Free and Equal” includes a detailed chapter on “Rawls and His Critics,” but mostly navigates around anything that might truly rattle the Rawlsian framework.

Perhaps Forrester wouldn’t be surprised by this move; as she puts it, “The capaciousness of liberal philosophy squeezed out possibilities for radical critique.”

And if divestment against Israel is carried out, when should it end?

Oil and gas divesting is meant never to end; oil and gas consumption is meant to end. Divestment from South Africa ended with apartheid.

So university leaders will be forced to ask an often heterogeneous group of students what would earn Israel its social license back. A cease-fire? A new Israeli government? A two-state solution? The end of Israel as a Jewish state?

But even if an endowment could provide a list of every underlying investment, it would likely then be inundated for more calls to divest, for more discovered connections — however small — to Israel, and for reasons related to other offenses discoverable with an online search

The answer, of course, is that endowments can’t be in the moral adjudication business — and they should never have headed this way

This does not mean that investing should be a returns-at-any-cost exercise. But it does mean that the real world does not always provide objective answers to how to balance benefits and consequences of companies providing products and services:

Dr. Longo, who is also a professor of gerontology and director of the U.S.C. Longevity Institute in California, has long advocated longer and better living through eating Lite Italian, one of a global explosion of Road to Perpetual Wellville theories about how to stay young in a field that is itself still in its adolescence.

In addition to identifying genes that regulate aging, he has created a plant and nut-based diet with supplements and kale crackers that mimics fasting to, he argues, allow cells to shed harmful baggage and rejuvenate, without the down side of actually starving.

He has patented and sold his ProLon diet kits; published best-selling books (“The Longevity Diet”); and been called an influential “Fasting Evangelist” by Time magazine.

Last month, he published a new study based on clinical trials of hundreds of older people — including in the Calabria town from which his family hails — that he said suggests that periodic cycles of his own faux-fasting approach could reduce biological age and stave off illnesses associated with aging.

“It’s very similar to the original Mediterranean diet, not the present one,” she said, pointing at photographs on the wall of a bowl of ancient legumes similar to the chickpe

“Almost nobody in Italy eats the Mediterranean diet,”

He added that many Italian children, especially in the country’s south, are obese, bloated on what he calls the poisonous five Ps — pizza, pasta, protein, potatoes and pane (or bread).

in recent years, Silicon Valley billionaires who hope to be forever young have funded secretive labs. Wellness articles have conquered newspaper home pages and Fountains-of-Youth workout and diet ads featuring insanely fit middle-aged people teem on the social media feeds of not insanely fit middle-aged people.

he said Italy’s lack of investment in research was a disgrace.

even as concepts like longevity, intermittent fasting and biological age — you’re only as old as your cells feel! — have gained momentum, governments like Italy’s are fretting over a creakier future in which booming populations of old people drain resources from the dwindling young.

many scientists, nutritionists and longevity fanatics the world over continue to stare longingly toward Italy, seeking in its deep pockets of centenarians a secret ingredient to long life.

“Probably they kept breeding between cousins and relatives,” Dr. Longo offered, referring to the sometimes close relations in little Italian hill towns. “At some point, we suspect it sort of generated the super-longevity genome.”

The genetic drawbacks of incest, he hypothesized, slowly vanished because those mutations either killed their carriers before they could reproduce or because the town noticed a monstrous ailment — like early onset Alzheimer’s — in a particular family line and steered clear.

Dr. Longo wonders whether Italy’s centenarians had been protected from later disease by a starvation period and old-fashioned Mediterranean diet early in life, during rural Italy’s abject war-era poverty. Then a boost of proteins and fats and modern medicine after Italy’s postwar economic miracle protected them from frailty as they got older and kept them alive.

At age 16, he moved to Chicago to live with relatives and couldn’t help notice that his middle-aged aunts and uncles fed on the “Chicago diet” of sausages and sugary drinks suffered diabetes and cardiovascular disease that their relatives back in Calabria did not.

He eventually earned his Ph.D in biochemistry at U.C.L.A. and did his postdoctoral training in the neurobiology of aging at U.S.C. He overcame early skepticism about the field to publish in top journals and became a zealous evangelizer for the age-reversing effects of his diet. About 10 years ago, eager to be closer to his aging parents in Genoa, he took a second job at the IFOM oncology institute in Milan.

He found a fount of inspiration in the pescatarian-heavy diet around Genoa and all the legumes down in Calabria.

he also found the modern Italian diet — the cured meats, layers of lasagna and fried vegetables the world hungered for — horrendous and a source of disease.

His private foundation, also based in Milan, tailors diets for cancer patients, but also consults for Italian companies and schools, promoting a Mediterranean diet that is actually foreign to most Italians today.

“Italy’s got such incredible history and a wealth of information about aging,” he said. “But spends virtually nothing.”

He talked about how he and others had identified an important regulator of aging in yeast, and how he has investigated whether the same pathway was at work in all organisms.

Dr. Longo said he thinks of his mission as extending youth and health, not simply putting more years on the clock, a goal he said could lead to a “scary world,” in which only the rich could afford to live for centuries, potentially forcing caps on having children

A more likely short-term scenario, he said, was division between two populations. The first would live as we do now and reach about 80 or longer through medical advancements. But Italians would be saddled with long — and, given the drop in the birthrate, potentially lonely — years burdened by horrible diseases.

The other population would follow fasting diets and scientific breakthroughs and live to 100 and perhaps 110 in relative good health.