150,000 years of human existence have passed, and yet what do we really know about our history before the advent of writing? Some of the most momentous events - including our origins, our migrations across the globe, and our acquisition of language - were lost in the darkness of 'prehistory'. But at last geneticists and other scientists are piecing together a history - the true story of Adam and Eve. Mapping Human History is nothing less than a 'history of prehistory'. Steve Olson travelled through four continents to discover the development of humans and our expansion throughout the planet....