JESSICA WILSON / SCIENCE PHOTO LIBRARY JESSICA WILSON / SCIENCE PHOTO LIBRARY
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Louis Pasteur (1822-1895), French microbiologist. Montage of images showing Pasteur's birthplace, his laboratory, and the development of his rabies vaccine. Pasteur was a French chemist and bacteriologist who founded the science of microbiology. Pasteur discovered that disease could be caused by bacteria transmitted from person to person (the germ theory of disease). He also developed vaccines for rabies and anthrax. Pasteur also found that lightly heating food and beverages could preserve them from souring. This pasteurization process is now widely used in the food industry. As a chemist, Pasteur discovered that some crystals had two forms, one that would rotate plane-polarized light to the left, and another that would rotate light to the right. This led to the development of stereochemistry.
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