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Sat, Apr 13, 2013 -- 1:00 PM

Radiolab

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Laughter -- We all laugh -- and you'll find that humor has very little to do with it. But what makes us laugh? To find out, the program tickles some rats, listens in on a baby's first laugh, talks to a group of professional laughers, and travels to Tanzania to investigate an outbreak of contagious laughter.

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