Bestselling author and renowned neuroscientist David Eagleman takes us on a spellbinding tour of our inner cosmos. What is reality? Why do you need other people? Where are we going as a species? An adjunct professor at Stanford University, Eagleman demonstrates how brain science is uniquely poised to address some of the biggest questions of our existence. To see the brain in action, he guides readers through the worlds of extreme sports, criminal justice, facial expressions, genocide, brain surgery, gut feelings, robotics, and the search for immortality. And from the tangle of billions of brain cells and trillions of connections, something emerges that you may not have expected in there: you.