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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Fresh Air Weekend: David O. Russell, 'Last Of The Unjust,' And 'Sonic Wonders'

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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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Fresh Air Weekend: 'Extreme Medicine,' Lake Street Dive, 'When We Get Home'

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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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Fresh Air Weekend: Tim Gunn, 'Borgen' And The Parenting Paradox

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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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Courtesy of Warner Bros. Pictures

Fresh Air Weekend: Joaquin Phoenix And A Self-Help Skeptic

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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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Fresh Air Weekend: Roger Ailes, Rosanne Cash And Sonia Sotomayor

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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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Fresh Air Weekend: Emma Thompson, Gary Shteyngart, 'Babylon' And 'Detective'

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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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Fresh Air Weekend: Mark Mulcahy, Netflix And 'Getting On'

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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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Fresh Air Weekend: Our Favorite Books, TV, Movies And Music Of 2013

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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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Fresh Air Weekend: The Coen Brothers And 'Anchorman 2'

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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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Fresh Air Weekend: Robert Redford, Ella Fitzgerald, Michael Sheen

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Alexander Payne arrives at the 69th annual Golden Globe Awards in 2012. Chris Pizzello/AP hide caption

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Fresh Air Weekend: Alexander Payne, Baby Photos And Ted Williams

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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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Fresh Air Weekend: Anjelica Huston, 'Nebraska' And Turkey Tips

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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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Fresh Air Weekend: 'Junkyard,' 'Great Beauty,' 'Narco Cultura,' Key And Peele

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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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Courtesy Touchstone Books

Fresh Air Weekend: Bruce Dern, Booker Ervin And 'Hyperbole And A Half'

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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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Bobby Fisher/Courtesy of Harper Collins

Fresh Air Weekend: Roy Choi, Industrial Musicals And 'The Story Of A New Name'

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