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500
(B.C.) Alcmaeon of Croton distinguished veins from arteries
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Jan 1, 1489
Leonardo da Vinci dissects corpses
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Anton van Leeuwenhoek discovers blood cells
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Edward Jenner develops the process of vaccination for smallpox, the first vaccine for any disease
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James Blundell performs the first successful transfusion of human blood
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Louis Pasteur identifies germs as cause of disease
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First contact lenses developed
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Insulin first used to treat diabetes.
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Persian physician Rhazes identifies smallpox
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(B.C.)The Egyptian Imhotep describes the diagnosis and treatment of 200diseases