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In 1918 the flu pandemic killed over 21 million people. The flu is still a prominent as of recent 2016, but there has been vaccinations created to prevent catching the flu during flu season. Also, there are early signs and ways to treat the flu.

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Francis Crick and James Waston in 1953 stated the structure of DNA and how DNA carried genetic information. From DNA a living organism, especially in humans, can tell how the structure is made up, relate to a family member, letting humans know how DNA makes up genes that family members share, and if there is a mishap in DNA what defects and illnesses occur.

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In 2002, giving military personnel and first responders the smallpox vaccinations to keep a bioterrorist attack from happening. With the way the world is handing over, that vaccination was in the best interest of the world. If an attacker got hold of that deadly disease, so many people's lives would be at stake.

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In 2002, The Netherlands was the first country to legalize euthunasia., so people do not have to suffer any more pain. Suffering for a very long time feels like an eternity. Having a choice to cut it short makes the person stop feeling. Though it is sad, this eliminates the cost for the patient if the person continues you to suffer. People have the right to do what they want in life, this gives them a choice.

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In 2008, the  first scarless surgery was performed. This is a major step in having surgery. Scarless surgery can alleviate pain, scars, and cutting through the body. Also, the recovery process is shorter. It is pure genius going through an opening. This will be future of how surgery is performed for patients.

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Pharmacopoeia was the first official drug directory. This allows modern health-care professionals to know the right amount dosage given to a patient, the side effects, and how to handle each and every drug. Without the creation of a pharmacopoeia, people could take to little or too much, not be aware of what could happen to one's self and even worse die.

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Identifying that the brain is physiological site was very influential. The brain is the mainstream where all activities start. Without the brain people are vegetables. The brain tells a lot about the body from emotions to a movement to speech. Not knowing the function of the brain would not have led the world to modern the world knows today.,

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The creation of hospitals was the greatest thing of this time. In the present time hospitals are everywhere and able to treat hundreds and hundreds of people at a time. Without hospitals, it would be harder to care for people and keep the people safe place. The hospital is a clean environment where it is less likely to catch something added on to the already illness or injury because the hospital has to be clean as possible.

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The discovery of dissection has led to the understanding of anatomy and physiology. Knowing the body and it's functions is the number thing to know in treating somebody. The dissection help tells where something is located in the body and give further study how it functions in that area of the body.

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In 1628, William Harvey discovered the circulation of blood to and from the heart. Shows the heart is the main source for dealing with blood. If the blood flow is stopped from the heart then that can easily be led to death.

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Apothecaries made, sold, and prescribed medications. This paved the way for the present pharmacies. The knowledge that comes with medications would not be known and also the safety of the medications so it won't be in the wrong hands.

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In 1794, Dr. Jesse Bennet performed the first C-Section birth. Now women are able to give birth to babies in a safer manner without pushing a baby out. Now it is practied millions of women.

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The first or earliest people to keep health records. The start of record keeping in the health field paved the way to keep records of patients, illnesses the patient had, medicines previously administered, etc. Doctors and other health-care professionals can love back on.

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The Arabs requiring physicians to pass exams and to obtain a license allowed not everybody to practice medicine on any and everybody. This brought in precautions and the safety of the patient, so an innocent life would not die or get untreated properly.

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Developed a vaccination for smallpox in 1796. Smallpox was a deadly disease at this time, so the creation of the vaccines makes the body immune and creates antibodies to fight the disease. Also, help make vaccines better and now smallpox is not common in the world as it was in the 18th century.

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The first successful blood transfusion in 1818. This was performed on humans by James Blundell. This paved the way to saving people's lives that really depends on somebody's blood to live.

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Dr. Philippe Pinel started to treat humans for mental illness in the 19th century. People can be ill mental and need just as much help as a person that is physically ill. Now in the world, people can be diagnosed and treated for mental illnesses that they might experience.

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In 1901, Carl Landsteiner classified the ABO blood groups. Certain types of blood can only take a type of blood or give a certain type of blood. Knowing the blood groups saves people's lives because if both parties have the same blood type, the blood is less able to reject the blood of a different blood type.

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Florence Nightingale paved the way for female nurses. Opening opportunities for females in the workforce. She also influenced cleanliness in hospitals. Because of her, the death rate went down by two-thirds.

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In 1774, Joesph Priestley discovered the element called oxygen. Without oxygen life in all living organisms would be impossible. Discovering oxygen has led findings of asthma, oxygen in red blood cells, people needing oxygen tanks to breathe on a daily basis and so much more.