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Duolingo’s CEO on how he built a $700 million company and why he gave away his first invention to Yahoo for free

You may never have heard of Luis von Ahn. But if you’ve ever verified that you’re not a robot online, you’ve probably used something he created. And that’s fine by him. He doesn’t read stories about himself, and when he says he’s not motivated by money, he …
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6 Brilliant Tesla Inventions That Never Got Built – History


History

6 Brilliant Tesla Inventions That Never Got Built
History
The invention? A military weapon that would accelerate mercury particles at 48 times the speed of sound inside a vacuum chamber and shoot a high-velocity beam “through the free air, of such tremendous energy that [it] will bring down a fleet of 10,000 …

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Baysdorfer brothers, Omaha’s very own fathers of invention, were behind the 1st automobile and airplane built in Nebraska

Editor’s note: This piece originally was published on Oct. 23, 2005, as part of David Harding’s “Everyday History” column in The World-Herald. The horseless carriage first appeared on Omaha streets when merchant Emil Brandeis paid the ungodly sum of $ 5,000 …
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Penn State Health: Medical Inventions Built to Save Lives – ABC27


ABC27

Penn State Health: Medical Inventions Built to Save Lives
ABC27
Penn State Heart and Vascular Institute is located on the campus of Penn State Health Milton S. Hershey Medical Center, a leading academic medical center located in Hershey, Pa. With a team of more than 50 physicians and surgeons, Penn State Heart and …

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