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William Harvey describes the circulation of blood to and from the heart.
Without this knowledge we wouldn't know why our hearts beat and how it keeps us alive.

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First blood transfusion successfully performed on animal in England.
This blood transfusion set the tone for physicians to successfully attempt to perform blood transfusions on humans.

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Joseph Priestley discovers the element of oxygen.
The element of oxygen is how the human race and other species live. The discovery made other discoveries possible and it also contributes to how the body runs.

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John Hunter introduces tube feeding.
If someone for some reason could not eat or swallow on their own, they now have tube feeding to help them so they don't die from starvation.

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Benjamin Franklin invents bifocals for glasses.
Without the invention of bifocals people wouldn't be able to see or improve their vision.

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Dr. Jessee Bennet performs the first Cesarean section.
If there was a complication during pregnancy and/or vaginal childbirth was prohibited, the baby and the mother could still survive by having a c-section.

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Rene Laennec invents the stethoscope.
The stethoscope helps determine the health of the heart, therefore helping doctors recognize if a patients needs treatment or not relating to the heart, etc.

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James Blundell performs first blood transfusion on human.
After the first blood transfusion was performed on an animal in 1667, performing it on humans was the next step. Blood transfusions are very important because if someone ever lost a lot of blood they could get some more blood and their life would be saved.

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Louis Pasteur suggests that human and animal diseases could be because of microorganisms.
This is an important discovery because without this discovery we might not know what could cause diseases.

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Joseph Lister starts using disinfectants and antiseptics during surgery.
Using disinfectants and antiseptics during surgery is very important because it helps prevent postoperative infections allowing more people to survive after surgery

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Robert Koch isolates the microorganisms in tuberculosis.
Without this discovery people would have continued to die and who knows what the population of the world would be nowadays.

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Dimitri Ivanofski discovers viruses.
The discovery of viruses allows scientists to try to come up with ways to fight viruses and educate the public so they don't develop any viruses.

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The first modern American medical school, John Hopkins University Medical School, was opened in Baltimore.
This first modern medical school started the chain of other medical schools all over the world, helping achieve the goals of people who want to pursue the medical career and help globally with the health of the world.

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Wilhelm Conrad Röntgen discovers x-ray.
Without the x-ray, doctors wouldn't be able to pinpoint breaks in bones and fix it or they might even misjudge the situation and mistake the break for a sprain, so the invention of x-ray really helps nevertheless.

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Carl Landsteiner classifies the ABO blood groups.
If a blood transfusion is given and you are given the wrong blood type, your immune system could act negatively towards it or you could even have a fatal response.

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Fredric G. Banting and C.H. Best isolates insulin.
Without insulin, millions of people would die. But since insulin was created for diabetics, they now can live life as they please as long as they regularly take their insulin.

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Sir Alexander Fleming discovers penicillin.
Penicillin now is a commonly used drug to help treat infections caused by bacteria. Penicillin is not the basis of every drug, but it definitely helped jump-start the creation of other drugs.

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Scientists such as Francis Crick and James Watson introduc the structure of DNA.
Without the discovery of the structure of DNA, we wouldn't know how we are made and how genetics work.

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The first test tube baby was born.
If a women or man was infertile, they could do the process of IVF so that they would still be able to have a baby. This helps adults all over the world who want to have a baby, but simply cannot.

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HIV was discovered by Robert Gallo and Luc Montagnier.
Without this discovery, the dangers of unprotected sex would still surface. At least with this discovery, it led to treatments to make the condition manageable and it also helped spread awareness to always stay protected during sex.