Variations On Chocolate Cake: Google's new Recipe View is designed to help cooks sift through recipes on the web. Here, the results for a search for Molten Chocolate Cake. NPR hide caption

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An image of Christchurch Cathedral, left, was taken one day before Tuesday's quake. On the right, an image posted to Twitter shows the extensive damage to the cathedral. Jerry Hawke/@senaz hide caption

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A still from the video game Call of Juarez: The Cartel. YouTube hide caption

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Researchers found that as groups of black-tailed prairie dogs and other rodents became larger, it also became easier to identify individuals. Kimberly Pollard/UCLA hide caption

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A mobile phone shows a Skype application. Josep Lago/AFP/Getty Images hide caption

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Feb. 4: Anti-government protesters held a sign referencing the Facebook social networking website that was important in organizing protesters in Tahrir Square. Chris Hondros/Getty Images hide caption

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Jeopardy contestants Ken Jennings (left), Brad Rutter and a computer named Watson. Carol Kaelson/AP hide caption

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