Fresh Air

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

itoggle caption Mariana Suarez/AFP/Getty Images

Fresh Air Weekend

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

At last, Russell is making the films "he was meant to make." For a rabbi who worked with the Nazis, is judgment "unjust"? And we follow one man's quest to find the "sonic wonders of the world."

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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

itoggle caption Mariana Suarez/AFP/Getty Images

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MIT is one of several schools that offer classes through edX, which provides free online courses in partnership with some of the country's top universities. Joe Raedle/Getty Images hide caption

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Larry Wilmore debuts Comedy Central's The Nightly Show with Larry Wilmore on Jan. 19. Stephen Lovekin/Getty Images for Comedy Central hide caption

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