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On this day in history — October 25, 1906: Inventor Lee de Forest filed a patent application for a vacuum-tube device to amplify weak electrical currents. Credit: U.S. Patent 841,387. #STEMWire (stem.news) 🛰️
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On this day in history — October 24, 1836: Inventor Alonzo D. Phillips patented improvements to friction-match manufacture and packaging designed to reduce accidental ignition. Credit: U.S. Patent 68. #STEMWire (stem.news) 🛰️
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On this day in history — October 23, 2001: Apple introduced the iPod, a portable digital music player with a 5GB hard drive and FireWire transfer. Credit: Apple. #STEMWire (stem.news) 🛰️
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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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