camthomaz15 camthomaz15

16-05-2017
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Jonas Salk became well known in the early 1950s because he

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TBella19 TBella19

16-05-2017

Jonas Salk became well known in the early 1950s because he invented the polio vaccine. He helped save tons of peoples lives by his invention.

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lanay369 lanay369

30-11-2018

developed a vaccine that virtually eliminated polio from American society.

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