Episode Synopsis "The Mysteries of the First Human Evolution "

The long evolutionary journey that created modern humans began with a single step-- or more accurately-- with the ability to walk on two legs. During that long interim, a menagerie of different human species lived, evolved and died out, intermingling and sometimes interbreeding along the way. As time went on, their bodies changed, as did their brains and their ability to think, as seen in their tools and technologies.

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