Why Do We Laugh?
b'Laughter: We do it spontaneously, we do it forcefully, we do it with each other and by ourselves. But why did we evolve to giggle in the first place?
Emily and Regina explore the evolutionary underpinnings of laughter \\u2014 from chimpanzees to modern-day humans \\u2014 and the ways it unites us.
Keep laughing with us on Twitter \\u2014 we\'re at @NPRShortWave \\u2014 or email the show at shortwave@npr.org.
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