Gazing at the stars, falling in love, or listening to music, we sometimes feel a transcendent connection with a cosmic unity and things larger than ourselves. But these experiences are not easily understood by science, which holds that all things can be explained in terms of atoms and molecules. Is there space in our scientific worldview for these spiritual experiences? Lightman weaves these investigations together to propose what he calls "spiritual materialism"-the belief that we can embrace spiritual experiences without letting go of our scientific worldview. In his view, the breadth of the human condition is not only rooted in material atoms and molecules but can also be explained in terms of Darwinian evolution. What is revealed in this lyrical, enlightening book is that spirituality may not only be compatible with science, it also ought to remain at the core of what it means to be human.