What If is written by a former NASA scientist. He employs physics, chemistry, mathematics and human biology to answer ridiculous most people have never thought of asking or even wondered about. It is a book filled with much humour, funny stick figures and hilarious detailed answers to the questions. I had to read it one or two chapters at a time to keep my brain from exploding. I could imagine Sheldon and his gang from the Big Bang Theory spending countless hours checking on the accuracy of the very convincing answers. Highly entertaining.