The Human Spark | Clip | A Matter of Size
A look at the brains of a rat, monkey, chimp and human and a discussion of why some brains are bigger than others.
A look at the brains of a rat, monkey, chimp and human and a discussion of why some brains are bigger than others.
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?