What if free will is an illusion? As Robert Sapolsky shows in this masterful account of the science of human behaviour, everything we think and do is caused by the luck of our biology and the influence of our environment, and ultimately both are beyond our control. In a world without free will, we must completely rethink what we mean by choice, responsibility, morality and justice. Sapolsky?s extraordinary book does exactly this, guiding us toward a profoundly fairer, more humane way of living together.