Prayer...meditation...speaking in tongues. What do these spiritual activities share and how do they differ? Why do some people believe in God, while others embrace atheism? From the ordinary to the extraordinary, beliefs give meaning to the mysteries of life. They motivate us, provide us with our individual uniqueness, and ultimately change the structure and function of our brains.

In Born to Believe, Andrew Newberg, MD, and Mark Waldman reveal -- for the very first time --...