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  Persian doctor who discovered the difference between measles and smallpox
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  Bloodletting becomes the standard form of treatment across the Medieval world.
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  "Schola Medica Salernitana" was the worlds first known medical school.
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  Roger of Sicily first stated that doctors needed a license to practice, showing that doctors were now under regulation.
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  Roger Bacon created spectacles, now commonly called glasses.
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  Leonardo da Vinci becomes the first person to dissect and study a human body.
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  Zacharius Janseen invents the microscope.
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  Sir Christopher Wren begins to experiment with canine blood fusions.
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  Scientist Anton van Leeuwenhoek discovers blood cells using a microscope.
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  Bacteria is discovered by scientist Anton van Leeuwenhoek.
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  Giacomo Pylarini gives the first vaccination for Smallpox.
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  Louis Pasteur discovers that germs are the cause for disease.
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  A vaccine for rabies is developed by Louis Pasteur.
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  Contact Lenses are developed.
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  Wilhelm Conrad Roentgen discovers how to create an X-Ray.
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  Karl Landsteiner makes the blood groups.
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  Karl Landsteiner creates the Band-Aid.
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  John Hopps created the first Cardiac Pacemaker.
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  Smallpox is finally eradicated.
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  HIV is discovered as a cause for AIDS.