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The Human Spark | Monkeys and Magic Fruit | PBS

Duration: 05:01

Researcher Laurie Santos demonstrates an illusion test she runs on free-ranging monkeys in Puerto Rico. Seeing how the monkeys respond opens a window onto the evolution of our own cognitive abilities and helps isolate the beginnings of the human spark. In The Human Spark, 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? Coming to PBS over three Wednesdays ...

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Post Date: December 2, 2009