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Online reviews are many, but it's often difficult to tell the real ones from the fakes. To help sort the genuinely delighted customers from profit-driven praise, researchers at Cornell University have developed software that can successfully tell the difference. Yanik Chauvin/iStockphoto hide caption

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Yanik Chauvin/iStockphoto

This NOAA satellite image shows Hurricane Irene as it approached the East Coast on Friday. AFP/Getty Images hide caption

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AFP/Getty Images

Passengers wait in line at the United Airlines terminal at Chicago's O'Hare airport in 2009 after a computer malfunction caused long delays and the cancellation of some United flights. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

Clyde Jackson (right) poses for a photo with his son, Clyde Jr., outside their new two-bedroom apartment in Greenbelt, Md. Jackson lost his three-bedroom home to foreclosure in December. Alex Kellogg/NPR hide caption

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Alex Kellogg/NPR

California Rep. Xavier Becerra was one of six Democrats chosen to join six Republicans on a panel tasked with finding a way to cut about $1 trillion from the federal deficit. Kris Connor/Getty Images hide caption

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Kris Connor/Getty Images

A house, like this one in Miami, represents a part of the American dream. But should the government help people attain it? Alan Diaz/ASSOCIATED PRESS hide caption

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Alan Diaz/ASSOCIATED PRESS

President Obama listens to questions at a town-hall-style meeting in Decorah, Iowa, on Monday. The president took a three-day bus tour through the Midwest to talk about the economy. Jim Watson/AFP/Getty Images hide caption

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Jim Watson/AFP/Getty Images

High-speed trades that outpace human decision-making are unhealthy for the markets, critics say. Andrew Burton/Getty Images hide caption

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Andrew Burton/Getty Images

Michigan Department of Human Services caseworker Sandy Satchel works at the Family Independence Agency in Detroit. In the past few years, welfare caseloads have dropped 2 percent in Michigan while unemployment has risen 54 percent, a trend that's reflected in other states. Carlos Osorio/AP hide caption

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Carlos Osorio/AP