Over the past two centuries, researchers have found bones and artifacts showing that people existed on earth millions of years ago. Deploying an unexpectedly great number of suppressed but convincing facts, Cremo and Thompson challenge readers to rethink their understanding of human origins, identity and destiny. Prejudices based on current scientific theory act as a 'knowledge filter', giving us a picture of prehistory that is largely inaccurate. This book reveals this hidden history. 69 illustrations.