Win Rosenfeld

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Video: Presidentiality: ‘Treason?’

In this new web series, Need to Know dissects the rhetoric of the campaign trail. This week: The annals of “treason” are filled with some of history’s most reviled traitors. Now, Texas Gov. Rick Perry has suggested a new candidate: Federal Reserve Chairman Ben Bernanke.

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Video: Polls and bears: Can markets predict elections better than pollsters?

Need to Know travels to Iowa to examine a unique futures market that may be better at predicting winning political candidates than traditional polling methods.

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Video: Using carrots, not sticks, to get companies to do good

Activists in San Francisco have created a new way of getting companies to do good: the anti-boycott. It uses carrots, not sticks, to get companies to do good.

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Video: All over the map: Behind the scenes, redrawing the political landscape

While the media and political junkies follow the candidates’ every move, the real action is happening out of the public eye, where congressional districts are being redrawn.

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Video: Why you can’t handle the truth: the psychology of belief

Science journalist Chris Mooney explains how our pre-existing beliefs, far more than facts, color our conclusions about the world, from politics to religion.

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Video: Twisted logic: What tornadoes don’t have to do with global warming

It’s been one of the deadliest tornado seasons on record. But meteorologist Harold Brooks of the National Severe Storms Laboratory warns: don’t blame it all on global warming.

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Video: Cracking the code: Defending against the superweapons of the 21st century cyberwar

Need to Know delves into the story of Stuxnet, the sophisticated and devastating computer virus that may launch a 21st century global arms race.

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Interactive: Who would you kill? Test your moral intuitions

An out-of-control train is hurtling down the track toward four trapped hikers. What do you do? Test your moral intuitions in life-or-death situations with this interactive quiz.

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Swallowing the whistle: Why we choose to do nothing when the stakes are high

Whether it’s a foul at the end of a basketball game or a an out-of-control train bearing down on four innocent people, human beings often choose to do nothing. Why? Sports Illustrated senior writer Jon Wertheim, author of “Scorecasting,” explains.