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Feature Film(7 min 21 sec) Poop. You flush it, and usually that’s the end of the story. But to scientists like Mark Smith, poop is more than just waste – it’s medicine.
Short Film(14 min 52 sec) Follow human geneticist Spencer Wells, Director of the Genographic Project of the National Geographic Society, as he tracks down the genetic changes associated with the ability to digest lactose as adults. Also available in Spanish.
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