The Four Realms of ExistenceOne of the world's leading experts on mind and brain takes us on an expedition that reveals a new view of what makes us who we are. Humans have long thought of their bodies and minds as separate spheres of existence. The body is physical the source of aches and pains. But the mind is mental; it perceives, remembers, believes, feels, and imagines. Although modern science has largely eliminated this mind body dualism, people still tend to imagine their