Humans have always been interested in their origins, but historians have been reluctant to write about the long stretches of time before the invention of writing. In fact, the deep past was left out of most historical writing almost as soon as it was discovered. This breakthrough book, as important for readers interested in the present as in the past, brings science into history to offer a dazzling new vision of humanity across time. Team-written by leading experts in a variety of fields, it maps events, cultures, and eras across millions of years to present a new scale for understanding the hu.