The Human Spark | Clip | Human Nature
A look at the ways in which monkeys and apes are similar to humans, not just biologically but mentally and socially.
A look at the ways in which monkeys and apes are similar to humans, not just biologically but mentally and socially.
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?