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They then compared the MRI data of participants who reported often feeling lonely with those who did not.

Researchers found the default networks of lonely people were more strongly wired together and surprisingly, their grey matter volume in regions of the default network was greater.

The fact the structure and function of this network is positively associated with loneliness may be because lonely people are more likely to use imagination, memories of the past or hopes for the future to overcome their social isolation.

In lonely people, the structure of this fibre tract was better preserved.

"In the absence of desired social experiences, lonely individuals may be biased towards internally-directed thoughts such as reminiscing or imagining social experiences.

Loneliness is increasingly being recognized as a major health problem, and previous studies have shown older people who experience loneliness have a higher risk of cognitive decline and dementia.

the urgency of reducing loneliness in today's society,

The genes of the oldest known residents of the Caribbean link them with the earliest populations that settled in Central and South America.

Part of the problem is that scientists have yet to find ancient DNA in the Caribbean that is more than 3,000 years old

The other problem is that ancient DNA is still scarce on the Caribbean coast of the mainland.

About 2,500 years ago, the archaeological record shows, there was a drastic shift in the cultural life of the Caribbean. People started living in bigger settlements, intensively farming crops like maize and sweet potatoes. Their pottery became more sophisticated and elaborate. For archaeologists, the change indicates the end of what they call the Archaic Age and the start of a Ceramic Age.

The skeletons from the Ceramic Age largely shared a new genetic signature. Their DNA links them to small tribes still living today in Colombia and Venezuela.

We don’t know a lot about these languages, although some words have managed to survive. Hurricane, for example, comes from hurakán, the Taino name for the god of storms.

The people bearing Ceramic Age ancestry came to dominate the Caribbean, with almost no interbreeding between the two groups.

These words bear a striking resemblance to words from a family of languages in South America called Arawak. The DNA of the Ceramic Age Caribbeans most closely resembles that of living Arawak speakers.

the new DNA findings had surprised him in many ways, giving him a host of new questions to investigate.

Over the course of the Ceramic Age, for example, strikingly new pottery styles emerged every few centuries. Researchers have long guessed that those shifts reflect the arrival of new groups of people in the islands. The ancient DNA doesn’t support that idea, though. There’s a genetic continuity through those drastic cultural changes. It appears that the same group of people in the Caribbean went through a series of major social changes that archaeologists have yet to explain.

Dr. Reich and his fellow geneticists also discovered family ties that spanned the Caribbean during the Ceramic Age. They found 19 pairs of people on different islands who shared identical segments of DNA — a sign that they were fairly close relatives. In one case, they found long-distance cousins from the Bahamas and Puerto Rico, separated by over 800 miles.

“The original idea was that people start in one place, they establish a colony someplace else, and then they just cut all ties to where they came from,” Dr. Keegan said. “But the genetic evidence is suggesting that these ties were maintained over a long period of time.”

Rather than being made up of isolated communities, in other words, the Caribbean was a busy, long-distance network that people regularly traveled by dugout canoe. “The water is like a highway,”

The genetic variations also allowed Dr. Reich and his colleague to estimate the size of the Caribbean society before European contact. Christopher Columbus’s brother Bartholomew sent letters back to Spain putting the figure in the millions

The DNA suggests that was an exaggeration: the genetic variations imply that the total population was as low as the tens of thousands.

now, with a population of about 44 million people, the Caribbean may contain more Taino DNA than it did in 1491.

Dr. Aviles and his colleagues have uploaded the ancient Caribbean genomes to a genealogical database called GEDMatch. With the help of genealogists, people can compare their own DNA to the ancient genomes. They can see the matching stretches of genetic material that reveal their relatedness.

with most polls indicating that it’s anyone’s guess who will carry Florida

held rallies in nearby Tampa on Thursday that underlined the polar-opposite realities each candidate now inhabits:

a conservative who said he had blocked Fox News on social media for being “too mainstream,”

“felt that it would be a good learning experience, so she could learn about some history and politics firsthand.”

Does he have a locker-room mentality?

“Yeah, sure, but I’m not hiring him to be nice.”

once overshadowed by Clearwater’s beach-retirement hub — has been transformed by recent years that have brought a mix of gentrification and progressive politics.

get-out-the-vote rally in honor of Representative John Lewis, the Georgia Democrat and voting rights champion who died over the summer

One in five Black Floridians is thought to have a felony conviction and could be unable to vote because of it.

“I’m not encouraging anyone to break the law, but today is a day for some ‘good trouble,’” she added, using one of Mr. Lewis’s signature phrases from his civil rights struggles

Mr. Overcast sighed. He said that living in the same county as the Church of Scientology’s headquarters had taught him how to tolerate almost any point of view, even that of the neighbor, who he suspected had stolen the Trump sign from his lawn.Mr. Overcast said his home security system had filmed the culprit making off with it. But rather than confront the neighbor, Mr. Overcast just bought another sign.“But with this one I tied 90 pounds of fishing line on it and tied it to a tree in my yard,” he said.

Billy Overcast — “spelled like the weather,” said Mr. Overcast, pointing up, however, to a typically clear day with one hand, a “Trump 2020” flag in the other.

Clearwater

The Confederate flag also bothered him, he told his fellow Jeep enthusiasts, as did the systemic racism

decorated with red, white and blue balloons; an American flag; a Black Lives Matter flag; another flag with an L.G.B.T. rainbow he found on Amazon; and lots of Biden-Harris campaign paraphernalia.

St. Petersburg and conservative Clearwater, the vacation hub and base of the Church of Scientology.

in the swing state that crowned past presidents by small margins, much in this country is riding o

n the all-important question of who flies what flag on which Jeep.

Pinellas County, about three-quarters of which is white, includes a good number of older retirees and suburban women

favor Joseph R. Biden Jr., the Democratic presidential nominee.

256,000 are registered as Democrats

252,000 as Republicans.

a swing county in a swing state

Donald J. Trump narrowly triumphed here by roughly 6,000 votes, out of about half a million cast

But postelection observers said her appeals to middle-class voters in Pinellas County didn’t resonate as well as Mr. Obama’s had.

“We want to be very clear that all we are reporting is observation of an excess (a fairly significant one) and not a discovery of any kind,”

“I’m trying to be calm here, but it’s hard not to be hyperbolic,” said Neal Weiner, a particle theorist at New York University. “If this is real, calling it a game changer would be an understatement.”

Dr. Aprile’s Xenon experiment is currently the largest and most sensitive in an alphabet soup of efforts aimed at detecting and identifying dark matter

The best guess is that this dark matter consists of clouds of exotic subatomic particles left over from the Big Bang and known generically as WIMPs, for weakly interacting massive particles, hundreds or thousands of times more massive than a hydrogen atom.

The story of axions begins in 1977, when Roberto Peccei, a professor at the University of California, Los Angeles, who died on June 1, and Helen Quinn, emerita professor at Stanford, suggested a slight modification to the theory that governs strong nuclear forces, making sure that it is invariant to the direction of time, a feature that physicists consider a necessity for the universe.

in its most recent analysis of that experiment, the team had looked for electrons, rather than the heavier xenon nuclei, recoiling from collisions. Among other things, that could be the signature of particles much lighter than the putative WIMPs striking the xenon.

Simulations and calculations suggested that random events should have produced about 232 such recoils over the course of a year.

But from February 2017 to February 2018, the detector recorded 285, an excess of 53 recoils.

Dr. Aprile and her colleagues have wired a succession of vats containing liquid xenon with photomultipliers and other sensors. The hope is that her team’s device — far underground to shield it from cosmic rays and other worldly forms of interference — would spot the rare collision between a WIMP and a xenon atom. The collision should result in a flash of light and a cloud of electrical charge.

this modification implied the existence of a new subatomic particle. Dr. Wilczek called it the axion, and the name stuck.

Axions have never been detected either directly or indirectly. And the theory does not predict their mass, which makes it hard to look for them. It only predicts that they would be weird and would barely interact with regular matter

although they are not WIMPS, they share some of those particles’ imagined weird abilities, such as being able to float through Earth and our bodies like smoke through a screen door.

In order to fulfill the requirements of cosmologists, however, such dark-matter axions would need to have a mass of less than a thousandth of an electron volt in the units of mass and energy preferred by physicists

(By comparison, the electrons that dance around in your smartphone weigh in at half a million electron volts each.) What they lack in heft they would more than make up for in numbers.

That would make individual cosmic dark-matter axions too slow and ethereal to be detected by the Xenon experiment.But axions could also be produced by nuclear reactions in the sun, and those “solar axions” would have enough energy to ping the Xenon detector right where it is most sensitive

The other exciting, though slightly less likely, possibility is that the Xenon collaboration’s excess signals come from the wispy particles known as neutrinos, which are real, and weird, and zipping through our bodies by the trillions every second.

Ordinarily, these neutrinos would not contribute much to the excess of events the detector read. But they would do so if they had an intrinsic magnetism that physicists call a magnetic moment. That would give them a higher probability of interacting with the xenon and tripping the detector

According to the standard lore, neutrinos, which are electrically neutral, do not carry magnetism. The discovery that they did would require rewriting the rules as they apply to neutrinos.

That, said Dr. Weiner, would be “a very very big deal,” because it would imply that there are new fundamental particles out there to look for — new physics.

Discokeryx xiezhi was an early relative of today’s giraffes, but more like a cousin and not a direct ancestor.

“To the best of our knowledge, D. xiezhi exhibits the most optimized head-butting adaptation in vertebrate evolution,” the researchers write in the paper.

The discovery of Discokeryx xiezhi suggests this fighting style and competition for mates may be a contributing factor in their long-neck evolution.

“In reality, it was likely a combination of natural selection ... for a particular dietary preference and sexual selection in that lineage that drove the evolution of modern giraffe necks and limbs,” Advait Jukar, a paleobiologist at Yale University who was not involved in the study tells Scientific American’s Rachel Nuwer.

Some reports appear to show that at least some of the gunman’s communications used Apple’s encrypted iPhone messaging services, which makes messages almost impossible for anyone else to read when sent to another iPhone user.

Facebook parent company Meta, which also owns Instagram, says it is working with law enforcement but declined to provide details.

A series of posts appeared on his Instagram in the days leading up to the shooting, including photos of a gun magazine in hand and two AR-style semi-automatic rifles. An Instagram user who was tagged in one post shared parts of what appears to be a chilling exchange on Instagram with Ramos, asking her to share his gun pictures with her more than 10,000 followers.

Meta has said it monitors people’s private messages for some kinds of harmful content, such as links to malware or images of child sexual exploitation. But copied images can be detected using unique identifiers — a kind of digital signature — which makes them relatively easy for computer systems to flag. Trying to interpret a string of threatening words — which can resemble a joke, satire or song lyrics — is a far more difficult task for artificial intelligence systems.

Facebook could, for instance, flag certain phrases such as “going to kill” or “going to shoot”, but without context — something AI in general has a lot of trouble with — there would be too many false positives for the company to analyze.

A recent Meta-commissioned report emphasized the benefits of such privacy but also noted some risks — including users who could abuse the encryption to sexually exploit children, facilitate human trafficking and spread hate speech.

Security experts say this could be done if Apple were to engineer a “backdoor” to allow access to messages sent by alleged criminals. Such a secret key would let them decipher encrypted information with a court order.

Greg Rutkowski, a hugely popular concept artist, has been used in a prompt for Stable Diffusion upward of 100,000 times. Now, his name is no longer attached to just his own work, but it also summons a slew of imitations of varying quality that he hasn’t approved. This could confuse clients, and it muddies the consistent and precise output he usually produces. When I saw what was happening to him, I thought of my battle with my shadow self. We were each fighting a version of ourself that looked similar but that was uncanny, twisted in a way to which we didn’t consent.

In theory, everyone is at risk for their work or image to become a vulgarity with A.I., but I suspect those who will be the most hurt are those who are already facing the consequences of improving technology, namely members of marginalized groups.

In the future, with A.I. technology, many more people will have a shadow self with whom they must reckon. Once the features that we consider personal and unique — our facial structure, our handwriting, the way we draw — can be programmed and contorted at the click of a mouse, the possibilities for violations are endless.

I’ve been playing around with several generators, and so far none have mimicked my style in a way that can directly threaten my career, a fact that will almost certainly change as A.I. continues to improve. It’s undeniable; the A.I.s know me. Most have captured the outlines and signatures of my comics — black hair, bangs, striped T-shirts. To others, it may look like a drawing taking shape.I see a monster forming.

Observations of predator behavior further piqued his interest. While filming and playing back his videos, he noted how cats stack their bodies behind their faces when they’re hunting. He interprets this, he said, as cats “trying to hide their heat” with their cold noses. He has also observed barn owls twisting as they swoop down, perhaps to shield their warmer parts — legs and wingpits — with cooler ones.

Maybe, he thought, “predators have to conceal their infrared to be able to catch a mouse.”

Eventually, these and other musings led Dr. Baker to place mouse hairs under a microscope. As it came into view, he felt a strong sense of familiarity. The guard hair in particular — the bristliest type of mouse hair — contained evenly-spaced bands of pigment that, to Dr. Baker, closely resembled structures that allow optical sensors to tune into specific wavelengths of light.

Thermal cameras, for instance, focus specifically on 10-micron radiation: the slice of the spectrum that most closely corresponds with heat released by living things. By measuring the stripes, Dr. Baker found they were tuned to 10 microns as well — apparently homed in on life’s most common heat signature. “That was my Eureka moment,” he said.

Koselleck observes that prior to the French revolution, a crisis was a medical or legal problem but not much more. After the fall of the ancien regime, crisis becomes the “structural signature of modernity”, he writes. As the 19th century progressed, crises multiplied: there were economic crises, foreign policy crises, cultural crises and intellectual crises.

When he looked at 5,000 creative individuals over 127 generations in European history, he found that significant creative breakthroughs were less likely during periods of political crisis and instability.

Victor H Mair, a professor of Chinese literature at the University of Pennsylvania, points out that in fact the Chinese word for crisis, wēijī, refers to a perilous situation in which you should be particularly cautious

“Those who purvey the doctrine that the Chinese word for ‘crisis’ is composed of elements meaning ‘danger’ and ‘opportunity’ are engaging in a type of muddled thinking that is a danger to society,” he writes. “It lulls people into welcoming crises as unstable situations from which they can benefit.” Revolutionaries, billionaires and politicians may relish the chance to profit from a crisis, but most people world prefer not to have a crisis at all.

A common folk theory is that times of great crisis also lead to great bursts of creativity.

The first world war sparked the growth of modernism in painting and literature. The second fuelled innovations in science and technology. The economic crises of the 1970s and 80s are supposed to have inspired the spread of punk and the creation of hip-hop

psychologists have also found that when we are threatened by a crisis, we become more rigid and locked into our beliefs. The creativity researcher Dean Simonton has spent his career looking at breakthroughs in music, philosophy, science and literature. He has found that during periods of crisis, we actually tend to become less creative.

psychologists have found that it is what they call “malevolent creativity” that flourishes when we feel threatened by crisis.

during moments of significant crisis, the best leaders are able to create some sense of certainty and a shared fate amid the seas of change.

These are innovations that tend to be harmful – such as new weapons, torture devices and ingenious scams.

A 2019 study which involved observing participants using bricks, found that those who had been threatened before the task tended to come up with more harmful uses of the bricks (such as using them as weapons) than people who did not feel threatened

Students presented with information about a threatening situation tended to become increasingly wary of outsiders, and even begin to adopt positions such as an unwillingness to support LGBT people afterwards.

during moments of crisis – when change is really needed – we tend to become less able to change.

When we suffer significant traumatic events, we tend to have worse wellbeing and life outcomes.

, other studies have shown that in moderate doses, crises can help to build our sense of resilience.

we tend to be more resilient if a crisis is shared with others. As Bruce Daisley, the ex-Twitter vice-president, notes: “True resilience lies in a feeling of togetherness, that we’re united with those around us in a shared endeavour.”

Crises are like many things in life – only good in moderation, and best shared with others

The challenge our leaders face during times of overwhelming crisis is to avoid letting us plunge into the bracing ocean of change alone, to see if we sink or swim. Nor should they tell us things are fine, encouraging us to hide our heads in the san

Waking up each morning to hear about the latest crisis is dispiriting for some, but throughout history it has been a bracing experience for others. In 1857, Friedrich Engels wrote in a letter that “the crisis will make me feel as good as a swim in the ocean”. A hundred years later, John F Kennedy (wrongly) pointed out that in the Chinese language, the word “crisis” is composed of two characters, “one representing danger, and the other, opportunity”. More recently, Elon Musk has argued “if things are not failing, you are not innovating enough”.

This means people won’t feel an overwhelming sense of threat. It also means people do not feel alone. When we feel some certainty and common identity, we are more likely to be able to summon the creativity, ingenuity and energy needed to change things.