He demonstrated protection against smallpox using cowpox material in 1796.

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HistoryOne small aha

Your new ahaEdward Jenner

His 1796 experiment helped launch immunology Source: Edward Jenner ↗

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24This French physicist discovered spontaneous radioactivity in uranium salts in 1896.RECALL
Henri Becquerel
Discovered in uranium salts
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25This general-purpose electronic computer built by Eckert and Mauchly was unveiled at the University of Pennsylvania in 1946.RECALL
ENIAC
Completed in the 1940s
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26Launched by the Soviet Union in 1957, this was the first artificial Earth satellite.RECALL
Sputnik 1
Launched in 1957
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