Louis Pasteur (1822-1895)

Louis Pasteur. Reproduced by permission of the Corbis Corporation. 
The French chemist and biologist Louis Pasteur is famous for his germ theory and for the development of vaccines. He made major contributions to chemistry, medicine, and industry. His discovery that diseases are spread by microbes, which are living organisms—bacteria and viruses—that are invisible to the eye, saved countless lives all over the world. He was born in 1822 AD and died in 1895 AD.

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