Bacteria are some of the smallest living things on Earth. They can live just about anywhere—from the hottest desert to the deepest ocean. Billions of bacteria even live on and inside our bodies! Many bacteria are helpful, but some cause deadly diseases. Inside this book, readers will view amazing close-up photographs as they learn about the history of microbiology and how to keep bacteria from making them sick. Fact boxes summarize interesting tidbits, also making it easy for report writers to find helpful information.