A New York Times and BusinessWeek bestseller.Most of us have no idea what's really going on inside our heads. Yet brain scientists have uncovered details every business leader, parent, and teacher should know-like that physical activity boosts your brain power.How do we learn? What exactly do sleep and stress do to our brains? Why is multi-tasking a myth? Why is it so easy to forget-and so important to repeat new information? Is it true that men and women have different brains?In Brain Rules, Dr John Medina, a molecular biologist, shares his lifelong interest in how the brain sciences might in.