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  Alcmaeon of Croton distinguishes the difference between veins and arteries.
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  The first pharmacy was established in Baghdad
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  They treated their patients through a majority of prayers, which is silly now looking back at it because no physical contact was made.
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  He discovered the difference between measles and smallpox.
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  He constructed the first magnifying glass. This helped with future examining of objects and medical research, such as cells or disease, that are too small for the human eye.
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  The hospitals were created for the sick.
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  The black plague killed around 60% of the European population. This meant that scientists and doctors had to discover a new vaccine or treatment quickly to cease the horrific disease.
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  He preforms a dissection on a hundred year old man, furthering his learning on how the inner body of a human functions.
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  Dutch lens grinder invents the microscope.
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  The first use of the scientific method is used. The method is used in every day medical practices ranging from any occupation.
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  He discovers blood cells
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  Invents the stethoscope.
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  Performs first, successful blood transfusion.
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  He stops the outbreak of cholera
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  First vaccine for cholera was created.
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  First vaccine for rabies.
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  The first vaccine for plague.
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  The first Nobel Prize for Physiology and Medicine was awarded to Emil Von Behring for his work on the development of a diphtheria antitoxin.
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  He discovered penicilin.
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  Penicillin was mass produced, creating the worlds first antibiotic.
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  Develops cardiac pacemaker to control irregular heartbeat.
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  The first full-body scan of a human in an MRI
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  The virus was found that causes aids, otherwise known as HIV.