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. 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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