publishedmedium:the proceedings of the national academy of sciences

  • Simple Sugars Wipe Out Beneficial Gut Bugs - Scientific American
    https://www.scientificamerican.com/podcast/episode/simple-sugars-wipe-out-beneficial-gut-bugs

    “[...] what our work actually shows is that both fructose and sucrose do make it to the colon where the microbiota exist. And second that these sugars impact a good bacterium even though nutrition is not involved.”

    In other words, the bacteria are not using fructose and sucrose as food. Instead, the sugars serve as signals that shut down production of a protein that beneficial Bacteroides need to colonize the intestine. The findings appear in the Proceedings of the National Academy of Sciences. [Guy E. Townsend II et al., Dietary sugar silences a colonization factor in a mammalian gut symbiont]

    Groisman says he’d like to explore whether complex polysaccharides can save Bacteroides from this sugary death sentence. Because then maybe we can eat cake and have our gut bugs too.

    #sucres #microbiote #colon

  • Can Mark Zuckerberg Fix Facebook Before It Breaks Democracy? | The New Yorker
    https://www.newyorker.com/magazine/2018/09/17/can-mark-zuckerberg-fix-facebook-before-it-breaks-democracy

    Since 2011, Zuckerberg has lived in a century-old white clapboard Craftsman in the Crescent Park neighborhood, an enclave of giant oaks and historic homes not far from Stanford University. The house, which cost seven million dollars, affords him a sense of sanctuary. It’s set back from the road, shielded by hedges, a wall, and mature trees. Guests enter through an arched wooden gate and follow a long gravel path to a front lawn with a saltwater pool in the center. The year after Zuckerberg bought the house, he and his longtime girlfriend, Priscilla Chan, held their wedding in the back yard, which encompasses gardens, a pond, and a shaded pavilion. Since then, they have had two children, and acquired a seven-hundred-acre estate in Hawaii, a ski retreat in Montana, and a four-story town house on Liberty Hill, in San Francisco. But the family’s full-time residence is here, a ten-minute drive from Facebook’s headquarters.

    Occasionally, Zuckerberg records a Facebook video from the back yard or the dinner table, as is expected of a man who built his fortune exhorting employees to keep “pushing the world in the direction of making it a more open and transparent place.” But his appetite for personal openness is limited. Although Zuckerberg is the most famous entrepreneur of his generation, he remains elusive to everyone but a small circle of family and friends, and his efforts to protect his privacy inevitably attract attention. The local press has chronicled his feud with a developer who announced plans to build a mansion that would look into Zuckerberg’s master bedroom. After a legal fight, the developer gave up, and Zuckerberg spent forty-four million dollars to buy the houses surrounding his. Over the years, he has come to believe that he will always be the subject of criticism. “We’re not—pick your noncontroversial business—selling dog food, although I think that people who do that probably say there is controversy in that, too, but this is an inherently cultural thing,” he told me, of his business. “It’s at the intersection of technology and psychology, and it’s very personal.”

    At the same time, former Facebook executives, echoing a growing body of research, began to voice misgivings about the company’s role in exacerbating isolation, outrage, and addictive behaviors. One of the largest studies, published last year in the American Journal of Epidemiology, followed the Facebook use of more than five thousand people over three years and found that higher use correlated with self-reported declines in physical health, mental health, and life satisfaction. At an event in November, 2017, Sean Parker, Facebook’s first president, called himself a “conscientious objector” to social media, saying, “God only knows what it’s doing to our children’s brains.” A few days later, Chamath Palihapitiya, the former vice-president of user growth, told an audience at Stanford, “The short-term, dopamine-driven feedback loops that we have created are destroying how society works—no civil discourse, no coöperation, misinformation, mistruth.” Palihapitiya, a prominent Silicon Valley figure who worked at Facebook from 2007 to 2011, said, “I feel tremendous guilt. I think we all knew in the back of our minds.” Of his children, he added, “They’re not allowed to use this shit.” (Facebook replied to the remarks in a statement, noting that Palihapitiya had left six years earlier, and adding, “Facebook was a very different company back then.”)

    In March, Facebook was confronted with an even larger scandal: the Times and the British newspaper the Observer reported that a researcher had gained access to the personal information of Facebook users and sold it to Cambridge Analytica, a consultancy hired by Trump and other Republicans which advertised using “psychographic” techniques to manipulate voter behavior. In all, the personal data of eighty-seven million people had been harvested. Moreover, Facebook had known of the problem since December of 2015 but had said nothing to users or regulators. The company acknowledged the breach only after the press discovered it.

    We spoke at his home, at his office, and by phone. I also interviewed four dozen people inside and outside the company about its culture, his performance, and his decision-making. I found Zuckerberg straining, not always coherently, to grasp problems for which he was plainly unprepared. These are not technical puzzles to be cracked in the middle of the night but some of the subtlest aspects of human affairs, including the meaning of truth, the limits of free speech, and the origins of violence.

    Zuckerberg is now at the center of a full-fledged debate about the moral character of Silicon Valley and the conscience of its leaders. Leslie Berlin, a historian of technology at Stanford, told me, “For a long time, Silicon Valley enjoyed an unencumbered embrace in America. And now everyone says, Is this a trick? And the question Mark Zuckerberg is dealing with is: Should my company be the arbiter of truth and decency for two billion people? Nobody in the history of technology has dealt with that.”

    In 2002, Zuckerberg went to Harvard, where he embraced the hacker mystique, which celebrates brilliance in pursuit of disruption. “The ‘fuck you’ to those in power was very strong,” the longtime friend said. In 2004, as a sophomore, he embarked on the project whose origin story is now well known: the founding of Thefacebook.com with four fellow-students (“the” was dropped the following year); the legal battles over ownership, including a suit filed by twin brothers, Cameron and Tyler Winklevoss, accusing Zuckerberg of stealing their idea; the disclosure of embarrassing messages in which Zuckerberg mocked users for giving him so much data (“they ‘trust me.’ dumb fucks,” he wrote); his regrets about those remarks, and his efforts, in the years afterward, to convince the world that he has left that mind-set behind.

    New hires learned that a crucial measure of the company’s performance was how many people had logged in to Facebook on six of the previous seven days, a measurement known as L6/7. “You could say it’s how many people love this service so much they use it six out of seven days,” Parakilas, who left the company in 2012, said. “But, if your job is to get that number up, at some point you run out of good, purely positive ways. You start thinking about ‘Well, what are the dark patterns that I can use to get people to log back in?’ ”

    Facebook engineers became a new breed of behaviorists, tweaking levers of vanity and passion and susceptibility. The real-world effects were striking. In 2012, when Chan was in medical school, she and Zuckerberg discussed a critical shortage of organs for transplant, inspiring Zuckerberg to add a small, powerful nudge on Facebook: if people indicated that they were organ donors, it triggered a notification to friends, and, in turn, a cascade of social pressure. Researchers later found that, on the first day the feature appeared, it increased official organ-donor enrollment more than twentyfold nationwide.

    Sean Parker later described the company’s expertise as “exploiting a vulnerability in human psychology.” The goal: “How do we consume as much of your time and conscious attention as possible?” Facebook engineers discovered that people find it nearly impossible not to log in after receiving an e-mail saying that someone has uploaded a picture of them. Facebook also discovered its power to affect people’s political behavior. Researchers found that, during the 2010 midterm elections, Facebook was able to prod users to vote simply by feeding them pictures of friends who had already voted, and by giving them the option to click on an “I Voted” button. The technique boosted turnout by three hundred and forty thousand people—more than four times the number of votes separating Trump and Clinton in key states in the 2016 race. It became a running joke among employees that Facebook could tilt an election just by choosing where to deploy its “I Voted” button.

    These powers of social engineering could be put to dubious purposes. In 2012, Facebook data scientists used nearly seven hundred thousand people as guinea pigs, feeding them happy or sad posts to test whether emotion is contagious on social media. (They concluded that it is.) When the findings were published, in the Proceedings of the National Academy of Sciences, they caused an uproar among users, many of whom were horrified that their emotions may have been surreptitiously manipulated. In an apology, one of the scientists wrote, “In hindsight, the research benefits of the paper may not have justified all of this anxiety.”

    Facebook was, in the words of Tristan Harris, a former design ethicist at Google, becoming a pioneer in “ persuasive technology.

    Facebook had adopted a buccaneering motto, “Move fast and break things,” which celebrated the idea that it was better to be flawed and first than careful and perfect. Andrew Bosworth, a former Harvard teaching assistant who is now one of Zuckerberg’s longest-serving lieutenants and a member of his inner circle, explained, “A failure can be a form of success. It’s not the form you want, but it can be a useful thing to how you learn.” In Zuckerberg’s view, skeptics were often just fogies and scolds. “There’s always someone who wants to slow you down,” he said in a commencement address at Harvard last year. “In our society, we often don’t do big things because we’re so afraid of making mistakes that we ignore all the things wrong today if we do nothing. The reality is, anything we do will have issues in the future. But that can’t keep us from starting.”

    In contrast to a traditional foundation, an L.L.C. can lobby and give money to politicians, without as strict a legal requirement to disclose activities. In other words, rather than trying to win over politicians and citizens in places like Newark, Zuckerberg and Chan could help elect politicians who agree with them, and rally the public directly by running ads and supporting advocacy groups. (A spokesperson for C.Z.I. said that it has given no money to candidates; it has supported ballot initiatives through a 501(c)(4) social-welfare organization.) “The whole point of the L.L.C. structure is to allow a coördinated attack,” Rob Reich, a co-director of Stanford’s Center on Philanthropy and Civil Society, told me. The structure has gained popularity in Silicon Valley but has been criticized for allowing wealthy individuals to orchestrate large-scale social agendas behind closed doors. Reich said, “There should be much greater transparency, so that it’s not dark. That’s not a criticism of Mark Zuckerberg. It’s a criticism of the law.”

    La question des langues est fondamentale quand il s’agit de réseaux sociaux

    Beginning in 2013, a series of experts on Myanmar met with Facebook officials to warn them that it was fuelling attacks on the Rohingya. David Madden, an entrepreneur based in Myanmar, delivered a presentation to officials at the Menlo Park headquarters, pointing out that the company was playing a role akin to that of the radio broadcasts that spread hatred during the Rwandan genocide. In 2016, C4ADS, a Washington-based nonprofit, published a detailed analysis of Facebook usage in Myanmar, and described a “campaign of hate speech that actively dehumanizes Muslims.” Facebook officials said that they were hiring more Burmese-language reviewers to take down dangerous content, but the company repeatedly declined to say how many had actually been hired. By last March, the situation had become dire: almost a million Rohingya had fled the country, and more than a hundred thousand were confined to internal camps. The United Nations investigator in charge of examining the crisis, which the U.N. has deemed a genocide, said, “I’m afraid that Facebook has now turned into a beast, and not what it was originally intended.” Afterward, when pressed, Zuckerberg repeated the claim that Facebook was “hiring dozens” of additional Burmese-language content reviewers.

    More than three months later, I asked Jes Kaliebe Petersen, the C.E.O. of Phandeeyar, a tech hub in Myanmar, if there had been any progress. “We haven’t seen any tangible change from Facebook,” he told me. “We don’t know how much content is being reported. We don’t know how many people at Facebook speak Burmese. The situation is getting worse and worse here.”

    I saw Zuckerberg the following morning, and asked him what was taking so long. He replied, “I think, fundamentally, we’ve been slow at the same thing in a number of areas, because it’s actually the same problem. But, yeah, I think the situation in Myanmar is terrible.” It was a frustrating and evasive reply. I asked him to specify the problem. He said, “Across the board, the solution to this is we need to move from what is fundamentally a reactive model to a model where we are using technical systems to flag things to a much larger number of people who speak all the native languages around the world and who can just capture much more of the content.”

    Lecture des journaux ou des aggrégateurs ?

    once asked Zuckerberg what he reads to get the news. “I probably mostly read aggregators,” he said. “I definitely follow Techmeme”—a roundup of headlines about his industry—“and the media and political equivalents of that, just for awareness.” He went on, “There’s really no newspaper that I pick up and read front to back. Well, that might be true of most people these days—most people don’t read the physical paper—but there aren’t many news Web sites where I go to browse.”

    A couple of days later, he called me and asked to revisit the subject. “I felt like my answers were kind of vague, because I didn’t necessarily feel like it was appropriate for me to get into which specific organizations or reporters I read and follow,” he said. “I guess what I tried to convey, although I’m not sure if this came across clearly, is that the job of uncovering new facts and doing it in a trusted way is just an absolutely critical function for society.”

    Zuckerberg and Sandberg have attributed their mistakes to excessive optimism, a blindness to the darker applications of their service. But that explanation ignores their fixation on growth, and their unwillingness to heed warnings. Zuckerberg resisted calls to reorganize the company around a new understanding of privacy, or to reconsider the depth of data it collects for advertisers.

    Antitrust

    In barely two years, the mood in Washington had shifted. Internet companies and entrepreneurs, formerly valorized as the vanguard of American ingenuity and the astronauts of our time, were being compared to Standard Oil and other monopolists of the Gilded Age. This spring, the Wall Street Journal published an article that began, “Imagine a not-too-distant future in which trustbusters force Facebook to sell off Instagram and WhatsApp.” It was accompanied by a sepia-toned illustration in which portraits of Zuckerberg, Tim Cook, and other tech C.E.O.s had been grafted onto overstuffed torsos meant to evoke the robber barons. In 1915, Louis Brandeis, the reformer and future Supreme Court Justice, testified before a congressional committee about the dangers of corporations large enough that they could achieve a level of near-sovereignty “so powerful that the ordinary social and industrial forces existing are insufficient to cope with it.” He called this the “curse of bigness.” Tim Wu, a Columbia law-school professor and the author of a forthcoming book inspired by Brandeis’s phrase, told me, “Today, no sector exemplifies more clearly the threat of bigness to democracy than Big Tech.” He added, “When a concentrated private power has such control over what we see and hear, it has a power that rivals or exceeds that of elected government.”

    When I asked Zuckerberg whether policymakers might try to break up Facebook, he replied, adamantly, that such a move would be a mistake. The field is “extremely competitive,” he told me. “I think sometimes people get into this mode of ‘Well, there’s not, like, an exact replacement for Facebook.’ Well, actually, that makes it more competitive, because what we really are is a system of different things: we compete with Twitter as a broadcast medium; we compete with Snapchat as a broadcast medium; we do messaging, and iMessage is default-installed on every iPhone.” He acknowledged the deeper concern. “There’s this other question, which is just, laws aside, how do we feel about these tech companies being big?” he said. But he argued that efforts to “curtail” the growth of Facebook or other Silicon Valley heavyweights would cede the field to China. “I think that anything that we’re doing to constrain them will, first, have an impact on how successful we can be in other places,” he said. “I wouldn’t worry in the near term about Chinese companies or anyone else winning in the U.S., for the most part. But there are all these places where there are day-to-day more competitive situations—in Southeast Asia, across Europe, Latin America, lots of different places.”

    The rough consensus in Washington is that regulators are unlikely to try to break up Facebook. The F.T.C. will almost certainly fine the company for violations, and may consider blocking it from buying big potential competitors, but, as a former F.T.C. commissioner told me, “in the United States you’re allowed to have a monopoly position, as long as you achieve it and maintain it without doing illegal things.”

    Facebook is encountering tougher treatment in Europe, where antitrust laws are stronger and the history of fascism makes people especially wary of intrusions on privacy. One of the most formidable critics of Silicon Valley is the European Union’s top antitrust regulator, Margrethe Vestager.

    In Vestager’s view, a healthy market should produce competitors to Facebook that position themselves as ethical alternatives, collecting less data and seeking a smaller share of user attention. “We need social media that will allow us to have a nonaddictive, advertising-free space,” she said. “You’re more than welcome to be successful and to dramatically outgrow your competitors if customers like your product. But, if you grow to be dominant, you have a special responsibility not to misuse your dominant position to make it very difficult for others to compete against you and to attract potential customers. Of course, we keep an eye on it. If we get worried, we will start looking.”

    Modération

    As hard as it is to curb election propaganda, Zuckerberg’s most intractable problem may lie elsewhere—in the struggle over which opinions can appear on Facebook, which cannot, and who gets to decide. As an engineer, Zuckerberg never wanted to wade into the realm of content. Initially, Facebook tried blocking certain kinds of material, such as posts featuring nudity, but it was forced to create long lists of exceptions, including images of breast-feeding, “acts of protest,” and works of art. Once Facebook became a venue for political debate, the problem exploded. In April, in a call with investment analysts, Zuckerberg said glumly that it was proving “easier to build an A.I. system to detect a nipple than what is hate speech.”

    The cult of growth leads to the curse of bigness: every day, a billion things were being posted to Facebook. At any given moment, a Facebook “content moderator” was deciding whether a post in, say, Sri Lanka met the standard of hate speech or whether a dispute over Korean politics had crossed the line into bullying. Zuckerberg sought to avoid banning users, preferring to be a “platform for all ideas.” But he needed to prevent Facebook from becoming a swamp of hoaxes and abuse. His solution was to ban “hate speech” and impose lesser punishments for “misinformation,” a broad category that ranged from crude deceptions to simple mistakes. Facebook tried to develop rules about how the punishments would be applied, but each idiosyncratic scenario prompted more rules, and over time they became byzantine. According to Facebook training slides published by the Guardian last year, moderators were told that it was permissible to say “You are such a Jew” but not permissible to say “Irish are the best, but really French sucks,” because the latter was defining another people as “inferiors.” Users could not write “Migrants are scum,” because it is dehumanizing, but they could write “Keep the horny migrant teen-agers away from our daughters.” The distinctions were explained to trainees in arcane formulas such as “Not Protected + Quasi protected = not protected.”

    It will hardly be the last quandary of this sort. Facebook’s free-speech dilemmas have no simple answers—you don’t have to be a fan of Alex Jones to be unnerved by the company’s extraordinary power to silence a voice when it chooses, or, for that matter, to amplify others, to pull the levers of what we see, hear, and experience. Zuckerberg is hoping to erect a scalable system, an orderly decision tree that accounts for every eventuality and exception, but the boundaries of speech are a bedevilling problem that defies mechanistic fixes. The Supreme Court, defining obscenity, landed on “I know it when I see it.” For now, Facebook is making do with a Rube Goldberg machine of policies and improvisations, and opportunists are relishing it. Senator Ted Cruz, Republican of Texas, seized on the ban of Jones as a fascist assault on conservatives. In a moment that was rich even by Cruz’s standards, he quoted Martin Niemöller’s famous lines about the Holocaust, saying, “As the poem goes, you know, ‘First they came for Alex Jones.’ ”

    #Facebook #Histoire_numérique

  • Grizzly bears go vegetarian due to climate change, choosing berries over salmon
    http://www.telegraph.co.uk/news/2017/08/25/grizzly-bears-go-vegetarian-due-climate-change-choosing-berries

    The study found that during the unusually warm summer of 2014, the bears, which would traditionally kill up to 75 percent of the salmon, were nowhere to be seen near the streams.

    Instead, they were in the hills busy munching on berries, which contain less protein and therefore take less energy to break down, causing them to gain weight more quickly.

    Biologists warned that changes caused by a warming planet were behind the bears’ unusual behavior and could affect the entire ecosystem.

    The researchers found that the forests around the streams suffered because the bears’ fish carcasses were no longer there to enrich the soil.

    “Bears switched from eating salmon to elderberries, disrupting an ecological link that typically fertilizes terrestrial ecosystems and generates high mortality rates for salmon,” the study said.

    On average, red elderberries are said to be ripening two and a half days earlier every decade.

    If the pattern continues, they will regularly overlap with the salmon by 2070.

    The study was published in the Proceedings of the National Academy of Sciences.

    #climat #alimentation #ours #écosystème #sols

  • Des études concernant le #prix_libre ?
    J’ai vécu le prix libre, au départ comme une initiative proposée uniquement dans certains lieux (libertaires), par certains groupes qui portent des idéologies radicales (anar). Mais ça semble se démocratiser.
    Alors je me demande quelles dérives sont possibles, et surtout quelles ficelles le prix libre utilise, donc je recherche des sources d’études sociales et économiques.

    J’ai déjà trouvé celle là, plutôt libérale :
    https://boingboing.net/2012/04/23/pay-what-you-like-pricing-stud.html
    PNAS :

    We investigate the role of identity and self-image consideration under “pay-what-you-want” pricing. Results from three field experiments show that often, when granted the opportunity to name the price of a product, fewer consumers choose to buy it than when the price is fixed and low. We show that this opt-out behavior is driven largely by individuals’ identity and self-image concerns; individuals feel bad when they pay less than the “appropriate” price, causing them to pass on the opportunity to purchase the product altogether.

    Source : http://www.pnas.org/content/109/19/7236.full.pdf
    Science :

    ...scientists tested pay-what-you-want (PWYW) pricing in three experiments. In the first, some boat tour riders were given the option to pay $15 for a photo of themselves, while others were asked for $5, and still others were asked for PWYW. More people bought photos under the $5 plan, about 64%, than when they could name their own price, about 55%. (Only 23% opted for the $15 photos.) Scientists think that when people have to decide on a fair price, fear of looking cheap keeps some from purchasing altogether, they report online today in the Proceedings of the National Academy of Sciences. In a second trial, researchers found that attendees at an amusement park paid five times more for a photo of themselves on a ride (such as the one above) under PWYW pricing if told that half the proceeds would go to charity. And in the third experiment, guests at a restaurant with PWYW pricing either paid someone directly for their meal or paid anonymously by slipping money into a box near the door on their way out. Customers paid about 13% more when they were anonymous than when they paid someone directly. In all cases, the team says, PWYW seems to work because we want to feel good about ourselves when doing it.

    reliée à celle là :
    http://www.numerama.com/magazine/22458-la-libre-fixation-du-prix-par-l-acheteur-payerait-plus-qu-imposer-le

    Le résumé publié dans le magazine Science n’apporte pas d’autre explication que la culpabilité que ressentirait le payeur anonyme.

    Il est amusant de voir que le modèle de Humble Bundle reprend les « ficelles » données par l’étude. Ainsi, le prix moyen donné par les clients est communiqué pour déculpabiliser ceux qui ne souhaitent pas donner plus.

    Tous s’accorde pour analyser l’expérience de RadioHead et non pas le prix de la cantine végane du coin… si t’es pas populaire, t’es rien.
    http://www.numerama.com/magazine/10864-l-experience-radiohead-a-fait-un-enorme-carton-financier.html

  • Gates Foundation research can’t be published in top journals : Nature News & Comment
    http://www.nature.com/news/gates-foundation-research-can-t-be-published-in-top-journals-1.21299

    Scientists who do research funded by the Bill & Melinda Gates Foundation are not — for the moment — allowed to publish papers about that work in journals that include Nature, Science, the New England Journal of Medicine (NEJM) and the Proceedings of the National Academy of Sciences (PNAS).

    #open_access #bill_gates (cette fois du bon côté !)

  • Climate change increases the risk of war, scientists prove | The Independent
    http://www.independent.co.uk/environment/climate-change-war-risk-increase-syria-isis-heatwave-drought-a7155401

    The idea of linking conflict to natural disasters has been controversial. Some previous studies which compared wars to temperature, for example, did not find a link.

    However for this study, described in a paper in the Proceedings of the National Academy of Sciences journal, the researchers used data from international #reinsurance firm Munich Re.

    This was then combined with information about conflicts and an index used to quantify how “ethnically fractionalised” countries are.

    Globally, there was a nine per cent coincidence rate between the outbreak of armed conflicts and natural disasters like droughts and heatwaves. But, in countries that were deeply divided along ethnic lines, this rose to about 23 per cent.

    #guerre #climat

    • While the findings suggest that climate-related disasters and conflicts often happen around the same time, there could be a third factor affecting their occurrence, says Buhaug.

      The authors point out that there might be a “hidden common cause” behind both, but they don’t go as far as suggesting what that cause could be. Buhaug suggests that a history of conflicts in a country or region would be a likely candidate. He tells Carbon Brief: “We know that conflict begets conflict, and conflict also is development in reverse – destroying economic activity and material products – thereby increasing the likelihood that a given meteorological event (drought, heat wave, flood) reaches the required level of severity [to cause conflict].

      In other words, a more unstable country is less likely to be able to help its citizens in the aftermath of a disaster – for example, by providing food and clean water – raising the risk of further violence breaking out.

      https://www.carbonbrief.org/climate-related-disasters-raise-conflict-risk-study-says

  • That Time in 8th Grade When an Electric Eel Almost Killed Sarah - Facts So Romantic
    http://nautil.us/blog/that-time-in-8th-grade-when-an-electric-eel-almost-killed-sarah

    When you’re a kid, it’s easy to take things for granted—to assume, for example, that your experiences, however unique, are relatively common. But then you find out way later in life that no, in fact not everyone tested the “Mary Poppins Theory of Gravity” by jumping off their hay barn clutching an umbrella, as I did, or was sung to sleep each night by the high-pitched bugling of the neighborhood elk herd. That sense of distinction is how I felt reading the news that a researcher at Vanderbilt University had finally corroborated a centuries-old tale about electric eels. I thought: People don’t know this already? This month, Kenneth Catania, a scientist with a passion for studying Electrophorus electricus, reported in the Proceedings of the National Academy of Sciences a peculiar behavior (...)

  • If #Google and #Facebook can flip elections does #code now rule the real world?
    https://www.newint.org/blog/2016/03/11/google-and-facebook-flip-elections-code-rules-the-world

    Recent research points to new – potentially more powerful [than political action committees] and not so clearly discernible – influencers. Robert Epstein, senior research psychologist at the American Institute for Behavioral Research and Technology and the former editor-in-chief of Psychology Today, warns of the ‘invisible’ power of social media and search engines to decide electoral outcomes. If ‘Google favours one candidate in an election, its impact on undecided voters could easily determine the election’s outcome,’ Epstein said this month. It is estimated that more than 60 per cent of the US population now gets its news through digital intermediaries such as Google, Facebook and Twitter. The reach of potential influence is therefore immense.

    Epstein and his colleague Ronald E Robertson reported their findings in the Proceedings of the National Academy of Sciences (PNAS) in August 2015. They explained that Google search algorithms produce, what they call, a ‘Search Engine Manipulation Effect’ and the researchers made the astonishing calculation that ‘Google now has the power to flip upwards of 25 per cent of the national elections in the world with no- one knowing this is occurring.’

    #algorithmes #influence #élections

  • California’s ongoing drought threatens nearly 60 million large trees
    http://news.mongabay.com/2015/12/californias-ongoing-drought-threatens-nearly-60-million-large-trees

    Now a study by researchers at the Washington, D.C.-based Carnegie Institution for Science has found that up to 58 million large trees in California — some of Earth’s oldest and most massive trees — have experienced severe canopy water loss between 2011 and today, putting them at severe risk.

    The Carnegie researchers, whose findings were published Monday in the Proceedings of the National Academy of Sciences, write that the impacts of this “millennial-scale event” on the health of forests has been relatively unknown until now.

    A report by the U.S. Forest Service released earlier this year found that as many as 12 million trees have been killed by the drought in California, but did not identify how many more trees were vulnerable due to the dry conditions.

    Progressive forest canopy water loss during the 2012–2015 California drought
    http://www.pnas.org/content/early/2015/12/22/1523397113.abstract?sid=50594317-96a2-4a6f-a6f8-5d6f29bf475d

    #sécheresse #Californie #eau #arbres #canopée

  • Dimock, PA Lawsuit Trial-Bound as Study Links Fracking to Water Contamination in Neighboring County | DeSmogBlog
    http://www.desmogblog.com/2015/05/08/dimock-pennsylvania-lawsuit-trial-study-fracking-water-contamination

    A recent peer-reviewed study published in the Proceedings of the National Academy of Sciences has confirmed what many fracking critics have argued for years: hydraulic fracturing for oil and gas can contaminate groundwater.

    #fracturation_hydraulique #eau

  • Fires linked to large-scale Greenland ice melt | The Arctic Journal

    http://arcticjournal.com/climate/722/fires-linked-large-scale-greenland-ice-melt

    A cocktail of rising temperatures and ash from forest fires led to large-scale surface melting of the Greenland ice sheet in 1889 and 2012, according to recent research from Dartmouth College and published in the Proceedings of the National Academy of Sciences.

    http://arcticjournal.com/sites/arcticjournal.com/files/styles/article_image_940x430/public/field/image/greenland-icecap-abledo.jpg?itok=YtSk5E63&c=032550400c9e2853c3989744e

    #groenland #climat #arctique #incendies

  • Brazil beef tax could spare forests | Climate News Network
    http://www.climatenewsnetwork.net/2014/05/brazil-beef-tax-could-spare-forests

    Scientists have come up with a new prescription to address the Amazon rainforest’s health problems: reduce deforestation more efficiently by taxing free-range beef.

    Researchers at the University of California, Berkeley, and international colleagues from Australia and the International Institute for Applied Systems Analysis in Austria, make their case in the Proceedings of the National Academy of Sciences.

    They argue that by taxing cattle on conventional pasture and by subsidising semi-intensive cattle rearing, Brazil could curb up to 26% of the global greenhouse gas emissions caused by the loss of forests − which in turn adds up to about one-fifth of all human-caused greenhouse gas emissions.

    #brésil #Amazonie #déforestation #industrie_bovine via @reka

  • New Study Finds Higher #Methane Emissions from Fracking « naked capitalism
    http://www.nakedcapitalism.com/2013/12/new-study-finds-higher-methane-emissions-from-fracking.html

    A major new study finds that methane emissions from the production of shale gas may in fact be higher than previously thought. The study, published in the Proceedings of the National Academy of Sciences [http://www.pnas.org/content/early/2013/11/20/1314392110.abstract] on November 25, casts into doubt the notion that natural gas produces half as much greenhouse gas pollution as coal. Natural gas has been embraced by many, including President Obama, as a centerpiece of America’s climate change plan.

    Methane can be released from natural gas wells during the drilling process. Scientists have thus far had difficulty measuring these “fugitive methane emissions” precisely, with competing studies stirring controversy. The latest report, published by a group of 15 scientists, found that the U.S. Environmental Protection Agency is significantly underestimating the amount of methane released during natural gas production. Specifically, the report concludes that fugitive methane emissions could be 50% higher than EPA estimates.

    (...)

    If the latest figures are accurate, it could mean that the greenhouse gas advantage that natural gas has over coal could be a mirage. The Energy Information Administration estimates that U.S. carbon dioxide emissions declined 12% since 2007, citing natural gas supplanting coal as a major reason. That number does not account for methane emissions however.

    #pollution #réchauffement_climatique #fracturation_hydraulique #gaz

  • New Study Finds U.S. Has Greatly Underestimated #Methane Emissions - NYTimes.com
    http://dotearth.blogs.nytimes.com/2013/11/25/new-study-finds-u-s-has-underestimated-methane-levels-in-the

    A comprehensive new study of atmospheric levels of methane, an important greenhouse gas released by leaky oil and gas operations and livestock, has found much higher levels over the United States than those estimated by the Environmental Protection Agency and an international greenhouse gas monitoring effort. The paper, “Anthropogenic emissions of methane in the United States,” is being published in the Proceedings of the National Academy of Sciences.

    (...)

    It’s important to note that the new study is a snapshot of conditions in 2007 and 2008, before concerns increased about the need for tighter standards for gas and oil drilling operations. The authors say a similar analysis is under for more recent years. A comparison will be very helpful in clarifying the impact of changed practices by energy companies so far, and what remains to be done.

  • World’s #water footprint linked to free trade
    http://blogs.nature.com/news/2012/02/world%e2%80%99s-water-footprint-linked-to-free-trade.html

    Researchers from the Netherlands have quantified and mapped the global water footprint, highlighting how patterns in international commerce create disparities in water use. The new study, published today in the Proceedings of the National Academy of Sciences, presents a spatial analysis of water consumption and pollution based on worldwide trade indicators, demographic data and water-usage statistics.


    #eau #cartographie #compliqué #cdp