Three radical changes in our diet made us human.The first, three million years ago, made our brains larger.The second, one hundred ten thousand years ago, shifted our brains into a higher gear.The third, sixty thousand years ago, made us, us.Part detective story, part ancient middle-east travelogue, the story of how we became us shows why the Fertile Crescent became the source of our genius and madness fifty thousand years ago.Herein you will find the root, where it all started.The Missing Link in the mystery of what it means to be human.