Society appears to be retreating from reason. Apparently harmless but utterly irrational belief systems from astrology to New Age mysticism, and clairvoyance to alternative health remedies, are booming. Evolutionary biologist Professor Richard Dawkins confronts this epidemic of irrational, superstitious thinking. He explains the dangers the pick and mix of knowledge and nonsense poses in the internet age, and passionately re-states the case for reason and science.