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  Discovered the difference between smallpox and measles.
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  believed humans could see through invisible beams of light.
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  frederick 2 made a new set of laws concerning medical education standards
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  By the end of 13th century the product was very well know.
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  First public dissection for students and spectators.
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  Italian doctor that suggested the epidemics may come from pathogens outside the body. (Indirect to direct)
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  the first written record of a mother and baby surviving a cesarean section
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  wrote a influential books on human anatomy. dissected a corpse and examined it.
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  Discovered that citrus fruits prevent scurvy.
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  a method to prevent people from smallpox.
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  Invents stethoscope
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  First succesfsul transfushion of human blood
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  Dentist uses nitrous oixde as an anesthetic.
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  Insulin first used to treat diabetes.
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  First vaccine for diphtheria
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  First vaccine for pertussis (whooping cough).
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  First vaccine for tuberculosis.
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  Firstvaccine for measles.
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  Jean michel dubernard did the first half face transplant.
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  the first HPV vaccine approved
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  The first kidney was grown in vitro in the U.S
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  First man to receive a penis transplant
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  3d print heart from human patients cells