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How are polar bears related to pandas? For thousands of years, philosophers and scientists have tried to organize and understand, or classify, the relationships among Earth's animals and plants. Early classification systems were cumbersome and inconsistent. In the late 1720s, Carl Linnaeus began developing a classification system to describe relationships among all living things, including animals, plants, fungi, and bacteria. This organization, called...

Chronicles the development of germ theory over the course of history, looking at various plagues and epidemics, including smallpox, and discussing the discovery of the link between bacteria and disease, viruses, and the emergence of superbugs and prions.