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  discovered the difference between measles and small pox
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  Avicenna writes The Book of Healing and The Cannon of Medicine
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  Amman ibn 'Ali al-Mawsili preformed the first successful eye surgery. Using a needle removing a cataract.
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  First documented hospital in England Canterbury
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  Invents spectates
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  provided health care for the sick
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  Frenchwoman who tried to practice medicine but was denied.
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  the use of the scientific method begins
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  Sir. Christopher Wren experiments with canine blood transfusion
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  Antoine Leeuwenhoek describes bacteria
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  Giacomo Pylarini gives the first smallpox inoculation
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  discovered the first vaccination
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  shows the importance of handwashing
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  stopped the outbreak of cholera
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  Rene Laennec invents the first stethoscope
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  the bubonic plague hits San Fransico
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  Alexander Fleming discovers penicillin
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  Robert S. Ledly invents the CAT-Scan
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  Invented the artificial kidney dialysis machine
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  Dolly the sheep was the first clone