Sapiens: A Brief History of Mankind - A Complete Summary Seventy thousand years ago, there were at least six different human species on earth. They were insignificant animals whose ecological impact was less than that of fireflies or jellyfish. Today, there is only one human species left: Us. Homo sapiens. But we rule this planet. Sapiens, the book, takes us on a breath-taking ride through our entire human history, from its evolutionary roots to the...