A bold, provocative history of our species finds the roots of civilization's success and failure in our evolutionary biology. We are living through the most prosperous age in all of human history, yet people are more listless, divided and miserable than ever. Wealth and comfort are unparalleled, and yet our political landscape grows ever more toxic, and rates of suicide, loneliness, and chronic illness continue to skyrocket. How do we explain the gap between these two truths? What's more, what can we do to close it? For evolutionary biologists Heather Heying and Bret Weinstein, the cause of our woes is clear: the modern world is out of sync with our ancient brains and bodies. We evolved to live in clans, but today most people don't even know their neighbors' names. Traditional gender roles once served a necessary evolutionary purpose, but today we dismiss them as regressive. The cognitive dissonance spawned by trying to live in a society we're not built for is killing us. In this book, Heying and Weinstein cut through the politically fraught discourse