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A LITTLE SOMETHING WORTH KNOWING

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HistoryOne small ahaInvention or discovery

This Russian chemist organized a periodic table that left gaps for undiscovered elements.

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Your new ahaDmitri Mendeleev

Dmitri Mendeleev was born in Tobolsk. Source: Wikidata: Dmitri Mendeleev ↗

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  1. 23He demonstrated protection against smallpox using cowpox material in 1796.RECALL
    Edward Jenner

    His 1796 experiment helped launch immunology

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  2. 24This French physicist discovered spontaneous radioactivity in uranium salts in 1896.RECALL
    Henri Becquerel

    Discovered in uranium salts

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  3. 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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