Answer:In 1947, Salk took a position at University of Pittsburgh, where he began conducting research on polio, also known as infantile paralysis. By 1951, Salk had determined that there were three distinct types of polio viruses and was able to develop a "killed virus" vaccine for the disease.
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Virginia's
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Virginia's Early Relations with Native Americans | Colonial Settlement, 1600s - 1763 | U.S. History Primary Source Timeline | Classroom Materials at the Library of Congress | Library of Congress.
Black lives matter movement
The Great Liberator of South America was Simon Bolivar. He was responsible for the secession of Venezuela, Boliva, Colombia, Ecuador, Peru, and Panama from the Spanish Empire
Price elasticity of demand is a concept which doesn't seem to be worth too much,... like: ' cigarettes sales aren't very affected by price changes because they're... you can use elasticity to figure out if raising or lowering the price is a good idea... it means changing the price will result in a huge change in quantity demanded. how is that answer.?
