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There was a discovery of blood types. Karl Landsteiner proved that everyone has a different blood type.
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Charles Drew established the first blood banks during World War II.
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Helen Taussing identified the heart defect that caused new born babies skin to be a blueish color. The skin did not have enough qxogen causing it to turn blue.
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Christian Barnard performed the first heart transplant of a human heart.
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Robert Jarvik was implanted with an artificial heart by the surgon, William DeVires.
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The United States Government approved a device that uses laser beams to unclog arteries of a heart.