We are living through the most prosperous age in all of human history, yet we are listless, divided and miserable. Wealth and comfort are unparalleled, but our political landscape is unmoored, and rates of suicide, loneliness and chronic illness continue to skyrocket. How do we explain the gap between these truths? And how should we respond? 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. This book draws on decades of their work teaching in college classrooms and exploring earth's most biodiverse ecosystems to confront today's pressing social ills - from widespread sleep deprivation and dangerous diets to damaging parenting styles and backward education practices. It outlines a science-based worldview that will empower you to live a better, wiser life.