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  • Human Spark

The Human Spark | Running = Big Brains? | PBS

Duration: 03:56
Program: Human Spark

Alan Alda talks to scientist Dan Lieberman about why the human ability to run could be an important prerequisite for the evolution of our bigger brains -- and the emergence of our 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?

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Post Date: September 25, 2009