Discovery Channel host and acclaimed writer Jay Ingram helps you find the answers to questions you've never really settled, like "What is d j vu?" "Why do we blink?", "Why are yawns contagious?" and the perennial "Do we really use only 10% of our brains?" Note that this book is a combined and abridged edition of The Science of Why and The Science of Why2. Have you ever wondered if people really do weird things...