Ideas about the soul and the afterlife, of sin and God's purpose have shaped human thinking for thousands of years. Religious rituals remain embedded in the major events of our lives. 　　In this thought-provoking series, evolutionary biologist Richard Dawkins asks what happens if we leave religion behind. 　　He explores what reason and science might offer to inspire and guide our lives in religion's place. Can science bring understanding in the face of death, help us tell right from wrong, or reveal the meaning of life?