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Coloring page of Louis Pasteur in a flat cap holding up a flask beside a microscope

Louis Pasteur
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Louis Pasteur was a French chemist born in 1822. He showed that tiny living things like bacteria and yeast are what make milk and wine go sour, and that heating them gently kills the germs that spoil them. That process is called pasteurization after him, and it's one reason the milk in a store stays fresh.

He also helped prove that germs cause many diseases, which changed how doctors worked, and he developed vaccines, including one for rabies in 1885.

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by Leanne Guenther
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