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Since Wikipedia is a compendium of information that already exists elsewhere, it reflects this long-standing bias. In addition, Wikipedia’s editorship–the tens of millions of volunteers who add, tinker with, and argue about articles–is not particularly diverse. “It’s largely younger, largely male, largely white,” Ayers says. “And people often write about their own interests, which is natural and makes sense. But what that means is that we have a lot of articles about software and famous military figures, and not a lot about, say, traditional women’s handicrafts or activists in the developing world.” For a site that aims to “really reflect the fullness of our collective human experience,” Ayers says, this is a big issue.

As the hackers dig in, roadblocks keep popping up–some common to all historical efforts, others unique to this one. One hacker, trying to separate a psychologist couple into two independent pages (“it’s like she’s glued to her husband’s side!”) has difficulty finding sources that credit the female half of the pair with anything. Another recalls making a prior effort, only to find her changes immediately reversed by the overzealous editors Hyland was talking about.

Knowledge, then, is less a canon than a consensus in a state of constant disruption. Part of the disruption has to do with error and its correction, but another part with simple newness—outright discoveries or new modes of classification and analysis, often enabled by technology.

ore commonly, however, changes in scientific facts reflect the way that science is done. Mr. Arbesman describes the "Decline Effect"—the tendency of an original scientific publication to present results that seem far more compelling than those of later studies. Such a tendency has been documented in the medical literature over the past decade by John Ioannidis, a researcher at Stanford, in areas as diverse as HIV therapy, angioplasty and stroke treatment. The cause of the decline may well be a potent combination of random chance (generating an excessively impressive result) and publication bias (leading positive results to get preferentially published). If shaky claims enter the realm of science too quickly, firmer ones often meet resistance. As Mr. Arbesman notes, scientists struggle to let go of long-held beliefs, something that Daniel Kahneman has described as "theory-induced blindness." Had the Austrian medical community in the 1840s accepted the controversial conclusions of Dr. Ignaz Semmelweis that physicians were responsible for the spread of childbed fever—and heeded his hand-washing recommendations—a devastating outbreak of the disease might have been averted.

A team of scientists unveiled a new tree of life on Monday, a diagram outlining the evolution of all living things. The researchers found that bacteria make up most of life’s branches.

This interactive timeline allows you to explore the evolution of English language and literature, from the 11th century to the present day. Scroll through decade by decade to investigate the richness and diversity of our poetry and prose, as well as the many social, cultural and political strands from which our language has been woven.

“English is not a language in India,” a friend once told me. “It is a class.” This friend, an aspiring Bollywood actor, knew firsthand what it meant to be from the wrong class. Absurd as it must sound, he was frequently denied work in the Hindi film industry for not knowing English. “They want you to walk in the door speaking English. Then if you switch to Hindi, they like it. Otherwise they say, ‘the look doesn’t fit.’ ” My friend, who comes from a small town in the Hindi-speaking north, knew very well why his look didn’t fit. He knew, too, from the example of dozens of upper-middle class, English-speaking actors, that the industry would rather teach someone with no Hindi the language from scratch than hire someone like him.

Analogously, emotion words like “anger,” “happiness” and “fear” each name a population of diverse biological states that vary depending on the context. When you’re angry with your co-worker, sometimes your heart rate will increase, other times it will decrease and still other times it will stay the same. You might scowl, or you might smile as you plot your revenge. You might shout or be silent. Variation is the norm.

The ease with which we experience emotions, and the effortlessness with which we see emotions in others, doesn’t mean that each emotion has a distinct pattern in the face, body or brain. Instead of asking where emotions are or what bodily patterns define them, we would do better to abandon such essentialism and ask the more revealing question, “How does the brain construct these incredible experiences?”

As the unofficial spokespeople for our organic-eating, Food Network-watching ways, when chefs talk, Americans tend to listen. And Dan Barber — the farm-to-table icon behind restaurants Blue Hill in New York City and Blue Hill Stone Barns in Tarrytown — isn’t wasting his platform.Barber has given a wildly popular TED talk, been counted among TIME’s 100 most influential people, been appointed to the President’s Council on Fitness, Sports & Nutrition and, as of last week, authored a nearly 500-page book laying out a radical new vision for the future of food.So when Barber came out last weekend with a New York Times op-ed detailing the shortcomings of the farm-to-table movement he had previously helped promote, people paid attention. While we like to pat ourselves on the back for eating seasonally and locally, Barber’s contentious argument went, the foodie fad that grew to become the face of sustainable eating has failed to bring about the promised revolution. Industrial agriculture still rules, Barber argued. And as it keeps growing, more and more small farms and native prairie disappear under Big Ag’s plow.If we really care about changing our food system (as anyone who hopes to feed our growing world should), Barber believes we’re going to need a true revolution. And “The Third Plate“ is his thesis, over a decade in the works, for what that change must look like.Among other things, change means thinking holistically, embracing diversity in ingredient choice and cuisine, and shifting meat over from its vaulted place at the center of the dinner plate. But while the solutions Barber describes are frighteningly extensive, they also, in his telling, sound delicious. That, more than any warning about the consequences of continuing along with the status quo, could be thing that ends up making a difference.

Certainly, experiments do show that a language can have a fascinating effect on how its speakers think. Russian speakers are on average 124 milliseconds faster than English speakers at identifying when dark blue shades into light blue. A French person is a tad more likely than an Anglophone to imagine a table as having a high voice if it were a cartoon character, because the word is marked as feminine in his language.This is cool stuff. But the question is whether such infinitesimal differences, perceptible only in a laboratory, qualify as worldviews — cultural standpoints or ways of thinking that we consider important. I think the answer is no.

Throughout the United States, many Native American languages are struggling to survive. According to Unesco, more than 130 of these languages are currently at risk, with 74 languages considered “critically endangered.” These languages preserve priceless cultural heritage, and some hold unexpected value — nuances in these languages convey unparalleled knowledge of the natural world. Many of these at-risk languages are found in my home state of California. Now for some, only a few fluent speakers remain.

“Probably the biggest empathy generator is cuteness: paedomorphic features such as large eyes, a large head, and a small lower face,” Steven Pinker, the Harvard psychologist, tells me. “Professional empathy entrepreneurs have long known this, of course, which is why so many charities feature photos of children and why so many conservation organizations feature pandas. Prettier children are more likely to be adopted, and baby-faced defendants get lighter sentences.”

Last week, Africa Is a Country, a blog that documents and skewers Western misconceptions of Africa, ran a fascinating story about book design. It posted a collage of 36 covers of books that were either set in Africa or written by African writers. The texts of the books were as diverse as the geography they covered: Nigeria, Zimbabwe, South Africa, Botswana, Zambia, Mozambique. They were written in wildly divergent styles, by writers that included several Nobel Prize winners. Yet all of books’ covers featured an acacia tree, an orange sunset over the veld, or both. + “In short,” the post said, “the covers of most novels ‘about Africa’ seem to have been designed by someone whose principal idea of the continent comes from The Lion King.”

A school in New York state has apologised after receiving complaints because a student recited the US Pledge of Allegiance in Arabic. The school's foreign language department arranged for the pledge to be read in a different language each day for a week. Complaints were received from people who lost family in Afghanistan and from Jewish parents, an official said. Neither the US nor New York state has an official language.

THE only time art ever seems to make news here in the West anymore is when a Pollock or Warhol sells for a sum commensurate with the budget of a “Transformers” film. It seems bizarre, then, to find ourselves grappling with international crises in which art is the issue: the imbroglio involving the Sony movie “The Interview,” the massacre at Charlie Hebdo in Paris. The incomprehension, whether bemused or horrified, that we feel toward people who take up arms against the creators of cartoons or comedies is a chastening reminder that there are still cultures in which art is not a harmless diversion or commodity, but something real and volatile, a potential threat to be violently suppressed. These attacks are, in a way, a savage, atavistic show of respect.