Template:Selected anniversaries/December 25: Difference between revisions
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||1975: Gunnar Kangro dies ... mathematician and author. Pic. | ||1975: Gunnar Kangro dies ... mathematician and author. Pic. | ||
||1981: Physicist Heinrich Johann Welker dies. Welker invented the "transistron", a transistor made at Westinghouse independently of the first successful transistor made at Bell Laboratories. He did fundamental work in III-V compound semiconductors, and paved the way for microwave semiconductor elements and laser diodes. | |||
||1991: Mikhail Gorbachev resigns as President of the Soviet Union (the union itself is dissolved the next day). Ukraine's referendum is finalized and Ukraine officially leaves the Soviet Union. | ||1991: Mikhail Gorbachev resigns as President of the Soviet Union (the union itself is dissolved the next day). Ukraine's referendum is finalized and Ukraine officially leaves the Soviet Union. | ||
Latest revision as of 08:06, 1 April 2024
1642: Isaac Newton born. He will be widely recognized as one of the most influential scientists of all time and a key figure in the scientific revolution.
1730: Physician and activist Filippo Mazzei born. Mazzei will act as an agent to purchase arms for Virginia during the American Revolutionary War.
1763: Inventor Claude Chappe born. Chappe will invent and develop a practical semaphore system that will span all of France -- the first practical telecommunications system of the industrial age.
2016: Astronomer and academic Vera Rubin dies. She discovered the discrepancy between the predicted angular motion of galaxies and the observed motion, by studying galactic rotation curves.