Secrets of the Human Body

206 bones. One heart. Two eyes. Ten fingers. You may think you know what makes up a human. But it turns out our bodies are full of surprises.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 your body is full of extraordinary mys...