The idea of putting blood into a person was a radical one when it was first attempted 350 years ago, but today, more than 15 million pints of blood are donated each year in the U.S. to be used in transfusions to over 5 million patients. Hank tells you the strange story of how blood transfusions got their start in medicine.
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Find more lesson plans like this:Abigail Adams: Biography, Facts & Accomplishments
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