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mainstream platforms learned their lesson, accepting that they should intervene aggressively in more and more cases when users post content that might cause social harm.

During the wildfires in the American West in September, Facebook and Twitter took down false claims about their cause, even though the platforms had not done the same when large parts of Australia were engulfed in flames at the start of the year

Twitter, Facebook, and YouTube cracked down on QAnon, a sprawling, incoherent, and constantly evolving conspiracy theory, even though its borders are hard to delineate.

A paper posted online last month has reignited a debate about one of the oldest, most startling claims in the modern era of network science: the proposition that most complex networks in the real world—from the World Wide Web to interacting proteins in a cell—are “scale-free.” Roughly speaking, that means that a few of their nodes should have many more connections than others, following a mathematical formula called a power law, so that there’s no one scale that characterizes the network.

Purely random networks do not obey power laws, so when the early proponents of the scale-free paradigm started seeing power laws in real-world networks in the late 1990s, they viewed them as evidence of a universal organizing principle underlying the formation of these diverse networks. The architecture of scale-freeness, researchers argued, could provide insight into fundamental questions such as how likely a virus is to cause an epidemic, or how easily hackers can disable a network.

Amazingly simple and far-reaching natural laws govern the structure and evolution of all the complex networks that surround us,” wrote Barabási (who is now at Northeastern University in Boston) in Linked. He later added: “Uncovering and explaining these laws has been a fascinating roller-coaster ride during which we have learned more about our complex, interconnected world than was known in the last hundred years.”

it’s a good time for a critical review of the technical literature of self-driving cars. This literature reveals that autonomous vehicles don’t work as well as their creators might like the public to believe.

The world is a 3-D grid with x, y, and z coordinates. The car moves through the grid from point A to point B, using highly precise GPS measurements gathered from nearby satellites. Several other systems operate at the same time. The car’s sensors bounce out laser radar waves and measure the response time to build a “picture” of what is outside.

It is a masterfully designed, intricate computational system. However, there are dangers.

“Falsehood flies, and the Truth comes limping after it,” Jonathan Swift once wrote.It was hyperbole three centuries ago. But it is a factual description of social media, according to an ambitious and first-of-its-kind study published Thursday in Science.

By every common metric, falsehood consistently dominates the truth on Twitter, the study finds: Fake news and false rumors reach more people, penetrate deeper into the social network, and spread much faster than accurate stories.

“It seems to be pretty clear [from our study] that false information outperforms true information,” said Soroush Vosoughi, a data scientist at MIT who has studied fake news since 2013 and who led this study. “And that is not just because of bots. It might have something to do with human nature.”

Urban airports like Boston’s Logan thought they had silenced noise issues with quieter planes. Now complaints pour in from suburbs 10 to 15 miles away because new navigation routes have created relentless noise for some homeowners. Photo: Alamy By Scott McCartney Scott McCartney The Wall Street Journal BiographyScott McCartney @MiddleSeat Scott.McCartney@wsj.com March 7, 2018 8:39 a.m. ET 146 COMMENTS saveSB107507240220

It turns out engines aren’t the major culprit anymore. New airplanes are much quieter. It’s the “whoosh” that big airplanes make racing through the air.

Computer models suggest slowing departures by 30 knots—about 35 miles an hour—would reduce noise on the ground significantly.

n recent years, it has become painfully clear that psychology is facing a “reproducibility crisis,” in which even famous, long-established phenomena—the stuff of textbooks and TED Talks—might not be real

Ironically enough, it seems that one of the most reliable findings in psychology is that only half of psychological studies can be successfully repeated

That failure rate is especially galling, says Simine Vazire from the University of California at Davis, because the Many Labs 2 teams tried to replicate studies that had made a big splash and been highly cited

Minimal manning—and with it, the replacement of specialized workers with problem-solving generalists—isn’t a particularly nautical concept. Indeed, it will sound familiar to anyone in an organization who’s been asked to “do more with less”—which, these days, seems to be just about everyone.

Ten years from now, the Deloitte consultant Erica Volini projects, 70 to 90 percent of workers will be in so-called hybrid jobs or superjobs—that is, positions combining tasks once performed by people in two or more traditional roles.

If you ask Laszlo Bock, Google’s former culture chief and now the head of the HR start-up Humu, what he looks for in a new hire, he’ll tell you “mental agility.

In the span of about six hours yesterday, The New York Times announced the hiring of Quinn Norton as a tech columnist and then apparently fired her. The Times claims that their decision to “go their separate ways” was guided by “new information,” revealed through a social-media maelstrom, about slurs Norton had used on Twitter and about her friendship with someone called weev. In October, Norton called weev “a terrible person, and an old friend of mine.” The rest of the world calls him a Nazi.

According to O’Brien, Auernheimer was an active user of a private chat server for Stormers, where, among other things, he forbade any members from talking to the police, coordinated a plan to send Nazis to Heather Heyer’s funeral, and wrote:

Auernheimer got involved with The Daily Stormer in 2014, after he was released from federal prison on identity-theft and hacking charges and living in Europe. Andrew Anglin, who was the focus of O’Brien’s story and who founded The Daily Stormer, said of Auernheimer in 2016, “I don’t know what I would be doing if it wasn’t for him ... He’s the one basically holding the whole thing together.”

Quinn Norton

The day before Valentine’s Day, social media created a bizarro-world version of me. I have seen strange ideas about me online before, but this doppelgänger was so far from resembling me that I told friends and loved ones I didn’t want to even try to rebut it. It was a leading question turned into a human form. The net created a person with my name and face, but with so little relationship to me, she could have been an invader from an alternate universe.

It started when The New York Times hired me for its editorial board. In January, the Times sought me out because, editorial leaders told me, the Times as an institution is struggling with understanding how technology is shifting society and politics. We talked for a while. I discussed my work, my beliefs, and my background.

Situated around 2,400 miles from the nearest continent, the Hawaiian Islands are about as remote as it’s possible for islands to be. In the last 5 million years, they’ve been repeatedly colonized by far-traveling animals, which then diversified into dozens of new species. Honeycreeper birds, fruit flies, carnivorous caterpillars ... all of these creatures reached Hawaii, and evolved into wondrous arrays of unique forms.

The most spectacular of these spider dynasties, Gillespie says, are the stick spiders. They’re so-named because some of them have long, distended abdomens that make them look like twigs. “You only see them at night, walking around the understory very slowly,” Gillespie says. “They’re kind of like sloths.” Murderous sloths, though: Their sluggish movements allow them to sneak up on other spiders and kill them.

Gillespie has shown that the gold spiders on Oahu belong to a different species from those on Kauai or Molokai. In fact, they’re more closely related to their brown and white neighbors from Oahu. Time and again, these spiders have arrived on new islands and evolved into new species—but always in one of three basic ways. A gold spider arrives on Oahu, and diversified into gold, brown, and white species. Another gold spider hops across to Maui and again diversified into gold, brown, and white species. “They repeatedly evolve the same forms,” says Gillespie.

This is the fog of late pandemic, and it is brutal. In the spring, we joked about the Before Times, but they were still within reach, easily accessible in our shorter-term memories. In the summer and fall, with restrictions loosening and temperatures rising, we were able to replicate some of what life used to be like, at least in an adulterated form: outdoor drinks, a day at the beach. But now, in the cold, dark, featureless middle of our pandemic winter, we can neither remember what life was like before nor imagine what it’ll be like after.

The sunniest optimist would point out that all this forgetting is evidence of the resilience of our species. Humans forget a great deal of what happens to us, and we tend to do it pretty quickly—after the first 24 hours or so. “Our brains are very good at learning different things and forgetting the things that are not a priority,” Tina Franklin, a neuroscientist at Georgia Tech, told me. As the pandemic has taught us new habits and made old ones obsolete, our brains have essentially put actions like taking the bus and going to restaurants in deep storage, and placed social distancing and coughing into our elbows near the front of the closet. When our habits change back, presumably so will our recall.

The share of Americans reporting symptoms of anxiety disorder, depressive disorder, or both roughly quadrupled from June 2019 to December 2020, according to a Census Bureau study released late last year. What’s more, we simply don’t know the long-term effects of collective, sustained grief. Longitudinal studies of survivors of Chernobyl, 9/11, and Hurricane Katrina show elevated rates of mental-health problems, in some cases lasting for more than a decade

While Wynn positions herself on the left, she is no dogmatic ideologue, readily admitting to points on the right and criticizing leftist arguments when warranted

She has described her work as “edutainment” and “propaganda,” and it’s both

But what makes her videos unique is the way Wynn combines those two elements: high standards of rational argument and not-quite-rational persuasion. ContraPoints offers compelling speech aimed at truth, rendered in the raucous, meme-laden idiom of the interne

In 1928, Santiago Ramón y Cajal, the father of modern neuroscience, proclaimed that the brains of adult humans never make new neurons. “Once development was ended,” he wrote, “the founts of growth and regeneration ... dried up irrevocably. In the adult centers the nerve paths are something fixed, ended and immutable. Everything must die, nothing may be regenerated.”

For decades, scientists believed that neurogenesis—the creation of new neurons—whirs along nicely in the brains of embryos and infants, but grinds to a halt by adulthood. But from the 1980s onward, this dogma started to falter. Researchers showed that neurogenesis does occur in the brains of various adult animals, and eventually found signs of newly formed neurons in the adult human brain.

Finally, Gage and others say that several other lines of evidence suggest that adult neurogenesis in humans is real. For example, in 1998, he and his colleagues studied the brains of five cancer patients who had been injected with BrdU—a chemical that gets incorporated into newly created DNA. They found traces of this substance in the hippocampus, which they took as a sign that the cells there are dividing and creating new neurons.

At particular sites, an itchy individual can attract the attention of the bluestreak cleaner wrasse—a slender fish, with blue and yellow markings and a prominent black stripe. On seeing these colors, the itchy “client” strikes a specific pose, allowing the wrasse to snake across its body, mouth, and gills, picking off parasites and dead skin along the way. The wrasse gets a meal. The client gets exfoliated. A single wrasse works for around four hours a day, and in that time, it can inspect more than 2,000 clients.

The wrasse are remarkably savvy about how they perform their services. Redouan Bshary, from the University of Neuchâtel, has shown that they sometimes cheat their clients by taking illicit bites of the protective mucus covering their skin. If the clients are watching, the wrasse restrain themselves from such shenanigans, in an effort to maintain their reputation. If disgruntled clients chase them, they try to make amends by offering a complementary fin massage. If high-status clients pop by—large, visiting predators like sharks or groupers—the cleaners prioritize them over smaller fish that live in the area. They’re surprisingly intelligent for fish.

And it seems that, by removing parasites, they also make other fish more intelligent.

In 1935, when both quantum mechanics and Albert Einstein’s general theory of relativity were young, a little-known Soviet physicist named Matvei Bronstein, just 28 himself, made the first detailed study of the problem of reconciling the two in a quantum theory of gravity. This “possible theory of the world as a whole,” as Bronstein called it, would supplant Einstein’s classical description of gravity, which casts it as curves in the space-time continuum, and rewrite it in the same quantum language as the rest of physics.

His words were prophetic. Eighty-three years later, physicists are still trying to understand how space-time curvature emerges on macroscopic scales from a more fundamental, presumably quantum picture of gravity; it’s arguably the deepest question in physics.

The search for the full theory of quantum gravity has been stymied by the fact that gravity’s quantum properties never seem to manifest in actual experience. Physicists never get to see how Einstein’s description of the smooth space-time continuum, or Bronstein’s quantum approximation of it when it’s weakly curved, goes wrong.

On the night before Halloween in 1938, a strange story crackled over radios across the United States. An announcer interrupted the evening’s regular programming for a “special bulletin,” which went on to describe an alien invasion in a field in New Jersey, complete with panicked eyewitness accounts and sounds of gunfire. The story was, of course, fake, a dramatization of The War of The Worlds, the science-fiction novel published by H. G. Wells in 1898. But not all listeners knew that. The intro to the segment was quite vague, and those who tuned in a few minutes into the show found no suggestion that what they were hearing wasn’t true.

The exact nature of the reaction of these unlucky listeners has been debated in the decades since the broadcast. Some say thousands of people dashed out of their homes and into the streets in terror, convinced the country was under attack by Martians. Others say there was no such mass panic. Regardless of the actual scale of the reaction, the event helped cement an understanding that would later be perpetuated in science-fiction television shows and films: Humans, if and when they encounter aliens, probably aren’t going to react well.

But what if the extraterrestrial life we confronted wasn’t nightmarish and intelligent, as it’s commonly depicted, but rather microscopic and clueless?

Some people can walk into a room and instantly put everyone at ease. Others seem to make teeth clench and eyes roll no matter what they do

A small body of psychology research supports the idea that the way a person tends to make others feel is a consistent and measurable part of his personality. Researchers call it “affective presence.”

10 years ago in a study by Noah Eisenkraft and Hillary Anger Elfenbein. They put business-school students into groups, had them enroll in all the same classes for a semester, and do every group project together

Kris Karnauskas, a professor of ocean sciences at the University of Colorado, has started walking around campus with a pocket-size carbon-dioxide detector. He’s not doing it to measure the amount of carbon pollution in the atmosphere. He’s interested in the amount of CO₂ in each room.

The indoor concentration of carbon dioxide concerns him—and not only for the usual reason. Karnauskas is worried that indoor CO₂ levels are getting so high that they are starting to impair human cognition.

Carbon dioxide, the same odorless and invisible gas that causes global warming, may be making us dumber.

The 2020 presidential election marks the first time more than two women have competed in the Democratic or Republican primaries, according to the Center for American Women and Politics at Rutgers University. Democratic congresswomen Tulsi Gabbard of Hawaii, Kirsten Gillibrand of New York, Kamala Harris of California, Amy Klobuchar of Minnesota, and Elizabeth Warren of Massachusetts have all thrown their hats in the ring. And Marianne Williamson, a bestselling author and a spiritual counselor to Oprah, is also running.

Research indicates that voters may unknowingly discriminate against female candidates for president because a woman has never held the position, and therefore a woman won't appear to be a "fit" for the role. Scholars call this the gender-incongruency hypothesis. For example, studies have shown that female candidates don't do worse than men when they run for local and state-wide office, but they don't fare as well when they run for president.

In a 2007 study published in the journal Basic and Applied Social Psychology, when students were given identical resumes of candidates who they were told were running for president -- a position which, of course, has never been held by a woman -- they judged the candidate to have more presidential potential and to have had a better career when the candidate was named Brian than when the person was named Karen. But when students were shown resumes of candidates running for Congress -- where women already hold seats -- they didn't judge Brian more positively than Karen.

, in 2000, the Nobel Prize-winning chemist Paul Crutzen won permanent fame for stratigraphy. He proposed that humans had so throughly altered the fundamental processes of the planet—through agriculture, climate change, and nuclear testing, and other phenomena—that a new geological epoch had commenced: the Anthropocene, the age of humans.

Zalasiewicz should know. He is the chair of the Anthropocene working group, which the ICS established in 2009 to investigate whether the new epoch deserved a place in stratigraphic time.

In 2015, the group announced that the Anthropocene was a plausible new layer and that it should likely follow the Holocene. But the team has yet to propose a “golden spike” for the epoch: a boundary in the sedimentary rock record where the Anthropocene clearly begins.