Why is it so hard to hold your breath? Why don't women have beards? Why do astronauts have to exercise? The answers to these and many more questions about what goes on inside our amazing bodies can be found in this fantastic book. Packed full of fascinating facts, this is the perfect guide to the clever and complex workings of your insides. From bones and brains to skin and cells, discover the what, why, and how of the exciting world of the human body.