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Discovered the difference between small pox and measles.
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Made a detailed description and diagram of the heart.
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invented the first reflecting microscope
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Discovered germs and bacteria and how to get rid of them.
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discovered the first X-ray
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Decided that the juice from the willow tree bark would not be effective anymore to reduce pain.
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He became one of America's first cardiologists
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discovers vitamin D and shows that its absence causes rickets
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used sterile maggots for infectious wound treatment
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