http://www.pbs.org/humanspark 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: January 6, 13, and 20, 2010 (check local listings). Learn more at http://www.pbs.org/humanspark
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