"206 bones. One heart. Two eyes. Ten fingers. What makes tears of joy different from tears of sadness? Why is a gut feeling so much smarter than you think? And why is 90% of you not even human? You may think you know the human body--heart, lungs, brain and bones--but our bodies are full of extraordinary mysteries that science is only just beginning to understand. This book will change forever how we think about our bodies. Thanks to cutting-edge science and cutting-edge technology we get a tantalizing glimpse beneath our skin, and there we see the secrets that make every ordinary human body ... extraordinary."--Page 4 of cover.