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Alan Alda visits dozens of scientists on three continents -- and even undergoes an examination of his own brain -- to find the answer to one question: What makes us human?

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The Human Spark
Full episodes
3 VIDEOS

So Human, So Chimp
54:42 Air Date 01/13/10

Monkeys and Magic Fruit
5:00 Air Date 12/15/09

Alan Alda and Man's Best Friend
5:11 Air Date 12/15/09