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Birth of Hippocrates, the Greek father of medicine begins the scientific study of medicine and prescribes a form of aspirin.
This is important because this is when we first began to study medicine and the affects it has on the human body.

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The Egyptian Imhotep describes the diagnosis and treatment of 200 diseases.
I think this is important because this is when we first started taking precautions about our health.

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Avicenna writes "The Book of Healing" and "The Canon of Medicine. "
This is important because we are starting to share our findings.

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Roger Bacon invents spectacles.
This is important because it impacted a lot of b]people who weren't able to see as well before.

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Zacharius Jannssen invents the microscope.
This is important because it helps us to see things that are small such as organisms and bacteria.

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William Harvey publishes An Anatomical Study of the Motion of the Heart and of the Blood in Animals.
This is important because it forms the basis for future research on blood vessels, arteries and the heart.

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Giacomo Pylarini gives the first smallpox inoculations.
This is important because we are finally able to cure something that was killing thousands of humans at the time.

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Edward Jenner develops the process of vaccination for smallpox, the first vaccine for any disease. This is important because he improved the vaccine.

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Anton van Leeuwenhoek observes bacteria.
This is important because we are now able to understand what is making us sick and the difference between good and bad bacteria.

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Anton van Leeuwenhoek discovers blood cells.
This is important because it later led to blood transfusions.

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William Morton, a dentist, is the first to publish the process of using anesthetic properties of nitrous oxide.
This is important because it made surgeries, such as removal of wisdom teeth, less painful.

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First vaccine developed for Bubonic plague.
This is extremely important considering the plague killed 25 million people.

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First test-tube baby is born. This is important because it helps mothers who are wanting a child but not able to perform birth.

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First contact lenses developed.
This had a big impact on us now. There are so many things that require contact lenses now such as sports, like soccer, football, baseball, and dance.

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Rene Laennec invents the stethoscope.
This is important because the stethoscope allows us to hear our heartbeat to hear if anything is wrong/irregular.

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Dr. Christiaan Barnard performs the first human heart transplant. This is an extremely important moment in history because we are now able to help people in need of a transplant more than before.

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Karl Landsteiner introduces the system to classify blood into A, B, AB, and O groups.
This is important because this helped us when handling blood transfusions.

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First vaccine to target a cause of cancer.
This is important because we are finally able to really begin finding the root of the problem for something has had no cure for decades.

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Charles Gabriel Pravaz and Alexander Wood develop the syringe.
This is important because it made sharing medicine easier and more accurate.

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Robert S. Ledley invents CAT-Scans.
This is important because with CAT Scans we are able to see inside of the body to see what is going on inside of it and find the cause of the problem.

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First vaccine for developed for rabies by Louis Pasteur.
This is important because he cured a disease caused by rabid animals and this also taught us to be more careful around wild animals.