Why does thunder rumble? Acoustic professor Trevor Cox explains that it has to do with the way lightning is a jagged line. "Each little kink is actually generating the sound, and the reason thunder rumbles is because the sound takes different time to come from different kinks because they're all slightly different distances from you," he says. Mariana Suarez/AFP/Getty Images hide caption

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Most of us have never been submerged under more than a few feet underwater. But just a few meters down, the water compresses the tissues of your body so that you become more dense. At that point, "You're more likely to sink than float," says Dr. Kevin Fong. iStockphoto.com hide caption

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"The term 'vegan leather' makes me think that you peeled a carrot and took the skin and made a jacket out of it," says Tim Gunn, pictured above at the Under the Gunn finale fashion show. Alberto E. Rodriguez/Getty Images hide caption

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Joaquin Phoenix's Her character, Theodore, has a job writing intimate — and sometimes erotic — cards and letters on behalf of other people. Courtesy of Warner Bros. Pictures hide caption

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In addition to being the first Hispanic to serve on the Supreme Court, Sonia Sotomayor was New York state's first Hispanic federal judge. Kainaz Amaria/NPR hide caption

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In Saving Mr. Banks, Emma Thompson plays Mary Poppins author P.L. Travers, who, Thompson says, hated the whole idea of having her book made into a film. Francois Duhamel/Disney Enterprises hide caption

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Alex Borstein (left) and Niecy Nash star as nurses in the HBO comedy series Getting On, which was modeled after the hit BBC series of the same name. Lacey Terrell/HBO hide caption

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Kevin Spacey (left) and Robin Wright star in House of Cards, directed by David Fincher. The Netflix series, which follows a Machiavellian politician, is an adaptation of a BBC series of the same name. Hear an interview with Spacey and Fincher. Patrick Harbron/Netflix hide caption

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Joel (left) and Ethan Coen wrote and directed Fargo, The Big Lebowski, O Brother Where Art Thou?, No Country for Old Men, A Serious Man and True Grit. Their latest film is Inside Llewyn Davis. Stuart C. Wilson/Getty Images hide caption

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In All Is Lost, Robert Redford plays an unnamed sailor, stranded at sea on a badly damaged yacht. Daniel Daza/Roadside Attractions/Lionsgate hide caption

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In a new memoir, Anjelica Huston recounts her childhood in Ireland, her teen years in London and her coming of age in New York. Robert Fleischauer/Courtesy of Scribner hide caption

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Keegan-Michael Key (left) and Jordan Peele both started their careers at Second City, Peele in Chicago and Key in Detroit. Ian White/Comedy Central hide caption

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You may recognize this drawing from Allie Brosh's popular "This Is Why I'll Never Be An Adult" blog post. (It's now a popular Internet meme.) Courtesy Touchstone Books hide caption

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Chef Roy Choi was named Food and Wine Magazine's Best New Chef in 2010. Bobby Fisher/Courtesy of Harper Collins hide caption

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