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when a scientific study ends by stating that there’s uncertainty about whether a correlation proves a cause, it doesn’t mean that correlations are meaningless in every circumstance. Everyone knows that creating false correlations between two unrelated elements is easy. But it can be that a correlation is so powerful and reliable that it may actually point to that rare thing in the social sciences, a demonstrable causal relation. As a wise man once said, “Correlation is not causation, but it sure is a hint.” When you can separate out a truly robust correlation between two elements in our social life, it’s a big deal. What makes a correlation causal? Well, it should be robust, showing up all over the place, across many states and nations; it should exclude some other correlation that might be causing the same thing; and, ideally, there ought to be some kind of proposed mechanism that would explain why one element affects the other. There’s a strong correlation between vaccines and less childhood disease, for instance, and a simple biological mechanism of induced immunity to explain it. The correlation between gun possession and gun violence—or, alternately, between gun control and stopping gun violence—is one of the most robust that you can find.

In a document written partly in Klingon, the society argued that while Paramount commissioned the creation of the language in 1984 from linguist Marc Okrand, the language “has taken on a life of its own.” There are groups of fans whose only shared language is Klingon. People have tried to raise children as native Klingon speakers. If a language is copyrighted, the group argued, then all ideas subsequently expressed in it could be too. Owning a language would mean having the right to block any future work in that language.

But now experts say a reliance on sat-navs and smartphone map apps is undermining map-reading skills. So here are five reasons why you should love maps and resist the easy attraction of the sat-nav.

Data specialist EMC estimates that in 2013 the world contained about 4.4 zettabytes (4.4 trillion gigabytes) of data. By 2020, it expects this to have risen tenfold.History, in other words, has gone online. While this means unprecedented instant access to vast stores of human knowledge and culture, it also means that mountains of digital data of crucial importance to archivists and future historians are potentially under threat from deletion, corruption, theft, obsolescence and natural or man-made disasters.

On 8 November 1939, Hitler was making his annual speech at a Munich beer hall. The event commemorated early Nazi struggles in the 1920s. This time Hitler used it to mock his international enemies, and boast about Germany's successful start to the war.But what neither Hitler nor the Nazi top brass and loyal audience realised was that, a few feet away from where the Fuehrer was standing, a bomb was about to go off . Its ticking timers carefully muffled in cork casing, it had been assembled and planted secretly over many weeks by Georg Elser. He had started making his plans the previous year, after deciding that, under Hitler, "war was unavoidable".Hitler began this speech at the same time every year, but on this occasion, eager to return to Berlin and his military planners, the Fuehrer left early.Thirteen minutes later, the bomb exploded, causing eight deaths and massive damage. The ceiling collapsed just above where Hitler had been standing.

ostering innovation and helping people to think analytically,

Called simply Bronze, it celebrates a metal so important it has its own age of history attached to it, and so responsive to the artist's skill that it breathes life into gods, humans, mythological creatures and animals with equal success.

It is remarkable to think that had Bronze been mounted say 15 years ago, the portrait of the past that it delivered would have been subtly different. History is very far from a done deal.

Is the distinction between crooked and uncrooked psychics meant to turn on the eye-poppingness of the sums involved?

In the absence of a means of distinguishing modest, everyday preying on the gullible from outright banditry, maybe every instance should be O.K.? Palm-reading is monetized around the globe, and no one seems to have a problem with it. People like having their palms read. People like fortune cookies, for God’s sake, one of the most brazen scams ever perpetrated. What business is it of the rest of us, a.k.a. “the state,” how our fellow-citizens satisfy their need for supernatural intervention?

But there was another puzzling thing about the crooked-psychic story: the fortune-teller failed to follow a primary rule of tradecraft. She neglected to cool the mark out. Having taken the very last dime, she needed to insure that the man from Brooklyn accepted his loss, and that he would not do as he did, and seek revenge and restitution. By failing to do this, she invited a nuisance that the fortune-telling racket has a mechanism for avoiding—the attention of the police. And then she got

The world has grown far too familiar with genocide; as mass killings have claimed countless lives, the word has become ingrained into our vocabularies. But the term didn't exist until 1943, when Polish lawyer Raphael Lemkin coined it — pairing the Greek "genos," meaning race or family, with the Latin "-cidere," for killing. Lemkin, who witnessed the massacres of the early 20th century, spent his life campaigning to make the world acknowledge and prosecute the crime. A new documentary, Watchers of the Sky, tells his story. Once he'd established the word, Lemkin worked persistently in the then-newly-formed United Nations, hounding delegates to discuss his new word and acknowledge the issue.

But worrying about data is probably just a distraction, because, ultimately, “pet” is a relative term—there are more fish in our home aquariums than there are pet dogs, and any category that lumps the two together feels inadequate.

Rabbits, as this passer-by is implying, are widely consumed in other countries. Western Europeans love rabbit sausage, slow-cooked rabbit stews, and braised bunny dishes, while the Chinese—who account for 30% of global rabbit consumption—consider rabbit’s head a delicacy. + Rabbit was even a staple of the American diet at one time. It helped sustain the European transplants who migrated west across the frontier, and during World War II, eating rabbit was promoted as an act of patriotism akin to growing a victory garden. But as small farms gave way to large-scale operations, rabbit meat’s popularity melted away and other meats took over.

Herzog started thinking about this 20 years ago, when he was sitting in a hotel bar having a beer with the psychologist and animal rights activist, Ken Shapiro. Herzog knew Shapiro was a vegan; Shapiro knew Herzog ate meat. Both men had read all of the same psychology and animal-rights literature, and both spent a lot of time working through the same philosophical questions. But somehow, they came to different conclusions about how to live their lives. + “Hal, I don’t get it: why aren’t you like us?” Shapiro suddenly asked. Herzog didn’t have an answer. He still doesn’t. + “I’ve been struggling with this for a long time,” Herzog says. “I can handle moral ambiguity. I can deal with it. So I don’t have that need for moral consistency that animal activists do.” He laughs a little. “And I know that their logic is better than mine, so I don’t even try arguing with them. They win in these arguments.” +

“Non-overlapping magisteria” has a nice ring to it. The problem is that there are many religious claims that not only “overlap” with empirical data but are incompatible with it. As a scientist who also spends a fair amount of time in the public arena, if I am asked if our understanding of the Big Bang conflicts with the idea of a six-thousand-year-old universe, I face a choice: I can betray my scientific values, or encourage that person to doubt his or her own beliefs. More often than you might think, teaching science is inseparable from teaching doubt.

A 19th-century French impressionist artist who perished almost a century ago is the world’s leading aesthetic terrorist; you just don’t know it.Fortunately, the Renoir Sucks at Painting (RSAP) movement is here to change that.

t the core of RSAP’s serious political critiques are Eurocentric aesthetics and beauty standards and the domination of art museums by white men. “If the problems with Eurocentricity were personified in a man, Renoir would be the disgusting” embodiment, Geller insisted.Geller did not mince words: “Renoir is the most pulsating, puss-ridden boil which is the most blatant essence of the problem,” he added.“The fact that this utter charlatan can get by the watchmen defending the high altar of art is the proof positive that the system is broken, and that, for far too long, these decisions have been made by people who have access to fancy art educations and pursue them with an eye toward dictating taste,” Geller explained.

Crohn’s disease affects as many as seven hundred thousand Americans, but, like other autoimmune disorders, it remains poorly understood and is considered incurable. (Autoimmune disorders are thought to arise when the immune system attacks healthy tissue, mistaking it for a threat.) The standard treatments for Crohn’s often don’t work, or work only temporarily, and many have serious side effects.

It’s sexist to ask a woman (but not a man) her maiden name, or to ask anyone for their mother’s maiden name. It’s none of their business, just its none of their business to know whether a woman is married (“Mrs”) or not (“Miss”) unless she chooses to tell them.

Too often in our debates about freedom of speech, we assume that it already exists and that it is campus activists, particularly over questions of race, who threaten it. But what Princeton’s students have shown is that, before they came along, there was in fact precious little speech about figures like Wilson, and what speech there was, was mostly bland PR for tourists and prospective students. Even more important, Princeton’s students have shown us that it is precisely the kinds of actions they have taken — which are uncivil, frequently illegal and always unruly — that produce speech.

While my general approach to history is one of modulation — past imperfect, always — I’m leery of those who would say, against the students, don’t erase the past. I’m leery of these critics’ timing: if there’s any erasing going on here, it’s in the daily practices of Princeton. In those campus tours, those campus addresses, the general celebration of the man. Why haven’t we heard criticism of how the past is being erased by Princeton’s celebration of Wilson?I’m also leery of these critics’ assumptions that removing a name from a building is about erasing the past. As if once the name is gone, all conversation stops, all memory disappears.