The Almanac
2 things science and human progress accomplished on this date.
1955
Researchers announced that Jonas Salk's polio vaccine worked, ending the fear that had shadowed families every summer. Mass vaccination soon pushed one of the century's most feared diseases toward elimination.
Source: Wikipedia
1961
Soviet cosmonaut Yuri Gagarin orbited the Earth aboard Vostok 1, becoming the first human being to travel into outer space. In 108 minutes he changed what people believed was possible.
Source: Wikipedia
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