 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, A 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.