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  Discovered difference between small pox and measles
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  This is important because now people who perform surgeries can now be paid and specialized in their craft.
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  The Book of Healing and The Canon of Medicine
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  Roger Bacon invented the spectacles
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  Roger Bacon constructed the first magnifying glass.
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  Black Death was an epidemic of bubonic plague, a disease caused by the bacterium Yersinia pestis that circulates among wild rodents. Estimated deaths were 75-200 people.
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  Tries to practice medicine, bur is denied
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  He dissects corpses
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  Zacharias Janssen invented the microscope
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  Ambroise Pare` was an army surgeon and he learned to do this by working with bodies
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  Discovered first vaccination
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  René Laënnec - a french physican, invented the stethoscope
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  With Dr. Morton's tenacity driven by enthusiasm and discovery, he and renowned surgeon at Massachusetts General Hospital, John Collins Warren made history
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  First woman to gain a medical degree from Geneva Medical College in New York
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  stops outbreak of chlorea
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  Tetanus - acute infectious disease of the central nervous system caused by the toxins of Clostridium tetani
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  Bernard Fantus starts the first blood bank at cook county hospital in Chicago.
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  Howard Florey and Ernst Chain develop method to produce usable form of penicillin
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  First vaccine was made to target a cause of cancer
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  Scientists discover how to use human skin cells to create embryonic stem cells