Template:Selected anniversaries/February 13: Difference between revisions

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||1961: An allegedly 500,000-year-old rock is discovered near Olancha, California, US, that appears to anachronistically encase a spark plug.
||1961: An allegedly 500,000-year-old rock is discovered near Olancha, California, US, that appears to anachronistically encase a spark plug.


File:Jan Łukasiewicz.jpg|link=Jan Łukasiewicz (nonfiction)|1956: Mathematician and philosopher [[Jan Łukasiewicz (nonfiction)|Jan Łukasiewicz]] dies.  He thought innovatively about traditional propositional logic, the principle of non-contradiction and the law of excluded middle.
File:Jan Łukasiewicz.jpg|link=Jan Łukasiewicz (nonfiction)|1956: Mathematician and philosopher [[Jan Łukasiewicz (nonfiction)|Jan Łukasiewicz]] dies.  Łukasiewicz contributed the principle of non-contradiction and the law of excluded middle, extending the bounds of traditional propositional logic.


||1967: American researchers discover the Madrid Codices by Leonardo da Vinci in the National Library of Spain.
||1967: American researchers discover the Madrid Codices by Leonardo da Vinci in the National Library of Spain.

Revision as of 08:41, 12 February 2020