Carroll, the award-wining author of The Particle at the End of the Universe, explains the difference between how the world works at the quantum, the cosmic, and the human levels?and how each connects to the other. Carroll examines the principles that have guided the scientific revolution from Darwin and Einstein to the origins of life, consciousness, and the universe. He explores how an avalanche of discoveries in the past few hundred years has changed our world and what really matters to us.