Jack ChallonerJack Challoner studied physics and is a trained science teacher, and has been writing books on all aspects of science and technology, and for all ages, for twenty years. He has written books on the brain, on reproduction, on the history of medicine, n nutrition and on cell biology. Jack has also worked in television, researching and advising on programs on a wide range of topics including human biology. Along the way, he has picked up some amazing insight into our amazing human body, and he wants to share it with you, in this book. Read More Read Less