 Many books on all these subjects. My father was a prolific writer, has many, many books. The Hypnotic States of Americans, Cure Stress, How Your Mind Will Make You Well, Gravity Driven Universe. My dad, I'm pretty sure that that last one right there, Gravity Driven Universe, that one someday is going to probably come to fruition many years after he's gone. But they will go, that guy was right.