On this day in history — October 22, 1938: Chester Carlson and Otto Kornei made the first xerographic copy in Astoria, New York, demonstrating dry electrostatic copying. Credit: Xerox. #STEMWire (stem.news) 🛰️
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On this day in history — October 21, 1824: Inventor Joseph Aspdin received a British patent for a cement-making process whose product he called Portland cement. Credit: British Patent 5,022. #STEMWire (stem.news) 🛰️
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On this day in history — October 20, 1903: Inventor Elmer Gates patented an educational shape-sorting toy with geometric blocks and matching openings. Credit: U.S. Patent 741,903. #STEMWire (stem.news) 🛰️
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On this day in history — October 19, 1941: Palmer C. Putnam’s team synchronized the first megawatt wind turbine with a commercial power grid. Credit: NASA. ntrs.nasa.gov/api/citations/… #STEMWire (stem.news) 🛰️
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