Examines the civilized world's achievements in controlling famine, disease, and war while making provocative predictions about the evolutionary goals of the twenty-first century.

"From a renowned historian comes a groundbreaking narrative of humanity's creation and evolution--a #1 international bestseller--that explores the ways in which biology and history have defined us and enhanced our understanding of what it means to be "human." One hundred thousand years ago, at least six different species of humans inhabited Earth. Yet today there is only one--homo sapiens. What happened to the others? And what may happen to us? Most...