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Invisible microbes cause sickness by invading our bodies and multiplying. But doctors didn't always know that sickness was caused by germs. Most people thought diseases came from smelly, damp air. But over time, those ideas changed. A Dutch scientist saw bacteria through his microscope. Doctors realized that when they washed their hands, fewer people died. And a doctor in London recognized that disease could spread through contaminated water. Because of these discoveries, people eventually learned that hygiene was the key to stopping disease. Hospitals used clean surgical instruments, and cities developed trash removal and sewage systems. Learn more about the discovery and defeat of bacteria

John Farndon is Royal Literary Fellow at Anglia Ruskin University in Cambridge, UK, and the author of a huge number of books for adults and children on science, technology, and nature.

Venitia Dean is a freelance illustrator who grew up in Brighton, UK. She has always loved drawing, ever since she could hold a pencil! As a teenager, she discovered a passion for figurative illustration, and then when she turned nineteen she was given a digital drawing tablet for her birthday and started transferring her work to the computer. She hasn't looked back since! As well as illustration, Venitia loves reading graphic novels and walking her dog, Peanut.