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  The Plague of Justinian effected (killed) 13% of the worlds population. Researchers think it is from extreme weather change.
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  Discovered difference between small pox and measles.
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  Medical care becomes regulated.
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  Avicenna writesThe Book of Healing and The Canon of Medicine.
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  Roger Bacon events the first pair of spectacles (glasses)
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  Islamic hospitals starts heath care for the sick.
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  Black Death disease destroyed about 1/3 of European population
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  Leonardo da Vinci dissects corpses
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  The use of the scientific method begins.
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  Printing press allows for publication of medical discoveries.
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  Antonio Van Leeuwenhoek describes bacteria.
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  The first smallpox inoculations was given.
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  James Lind publishes his Treatise of the Scurvy stating that citrus fruits prevent scurvy.
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  The first successful appendectomy was performed.
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  Edward Jenner developed the process vaccination for smallpox.
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  Sir Humphry Davy discovers the anesthetic properties of nitrous oxide.
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  First vaccine developed for chicken pox.
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  First test-tube baby is born.
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  HIV the virus that causes AIDS, is identified.
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  Willem J. Kolff invented the artificial kidney dialysis machine
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  First vaccine to target a cause of cancer.