On this day: April 12

POSTED: 02:42 PM PDT Apr 09, 2013    UPDATED: 11:00 PM PDT Apr 11, 2013 

The American Civil War begins, FDR dies, a Soviet cosmonaut becomes the first human to travel into space, and the first space shuttle lifts off, all on this day.

OTD April 12 - polio vaccine
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Public domain

1955: The polio vaccine, developed by Dr. Jonas Salk (right), is declared safe and effective.

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