Few people stop to consider they're not alone in their body. It's thought that the human body contains 10 times more bacteria than cells, in fact! Luckily, many of these microorganisms are harmless to us, and some are even very helpful. This fascinating look at nature's smallest life-forms is a high-interest introduction to the world of bacteria, viruses, and other microbes. More astonishing than the data and facts are the amazingly up-close photographs on each page. Readers may squirm, but they'll also come to appreciate the remarkable habitat called the human body.