Where once science painted humans as self-seeking and warlike, today scientists of many disciplines are uncovering the deep roots of human goodness. At the forefront of this revolution in scientific understanding is the Greater Good Science Center, based at the University of California, Berkeley. The center fuses its cutting-edge research with inspiring stories of compassion in action in Greater Good magazine. The best of these writings are collected here, and contributions from Steven Pinker, Robert Sapolsky, Paul Ekman, Michael Pollan, and the Dalai Lama, among others, will make you think not only about what it means to be happy and fulfilled but also what it means to lead an ethical and compassionate life.