Why are humans one of the few species to have sex in private? Why do humans have sex any day of the month or year—including when the female is pregnant, beyond her reproductive years, or between her fertile cycles? Why are human females the...

The Pulitzer Prize-winning author of Guns, Germs, and Steel examines the downfall of some of history's greatest civilizations In his million-copy bestseller Guns, Germs, and Steel, Jared Diamond examined how and why Western civilizations develope...