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Founded surgery, pathology, and said that amputations were a last resort.
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He came up with the smallpox vaccination.
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He invented laughing gas.
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Invented the stethoscope.
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He found out what chloroform could do.
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She figured out that food does help to stay healthy. She also tried to have better facilities for the soldiers.
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Prevention of food spoilage, and the control of disease.
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He studied how broken bones heal.
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He discovered Tuberculosis and how to help fight the disease, as well as others.
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He discovered x-rays.
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