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In 1628, Doctor William Harvey discovered that the human body had a circulatory system and that the blood flowed and didn't sit still.
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In 1796, Benjamin Waterhouse discovered the smallpox vaccine and introduced it to the U.S.
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A dentist named Peabody was the first man to add soap to dental paste and and proved that he teeth could be cleaned.
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William Morton, a Boston dentist used sulfuric ether to remove a tumor in a mans neck.
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A chemist named Felix Hoffman was experimenting with salicylic acid and create aspirin.
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Paul White introduces the electrocardiograph to the united states.
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Frederick Banting discovered the islets of langerhans and the hormone insulin and how it regulates blood sugar.
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Philip Drinker invents the iron lung to help patients that are polio-paralyzed breathe.
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Joseph Murray performs the first kidney transplant on a set of twins.
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Jonas Salk discovered the polio vaccine and first administered it to children.