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Eli Whitney and the Cotton Gin

Eli Whitney and the Cotton Gin

  On December 8, 1765, American inventor Eli Whitney was born. Whitney is best known for inventing the cotton gin. This was one of the key inventions of the Industrial Revolution and shaped the economy of the Antebellum South. Whitney’s invention made upland short cotton into a profitable crop, which strengthened…
Evolution is not Reversible – Louis Dollo

Evolution is not Reversible – Louis Dollo

On December 7, 1857, French-born Belgian palaeontologist Louis Dollo was born. Dollo is best known for his work on dinosaurs. He also posited that evolution is not reversible, known as Dollo’s law. Together with the Austrian Othenio Abel, Dollo established the principles of paleobiology. Louis Dollo was born in Lille, Nord-Pas-de-Calais.…
George Uhlenbeck and the Electron Spin

George Uhlenbeck and the Electron Spin

On December 6, 1900, Dutch-American theoretical physicist George Eugene Uhlenbeck was born. Together with with Samuel A. Goudsmit, Uhlenbeck proposed the concept of electron spin (Jan 1925) – a fourth quantum number which was a half integer. George Uhlenbeck was the son of Eugenius Uhlenbeck, who served in the Dutch…
The Airplanes of Glenn Luther Martin

The Airplanes of Glenn Luther Martin

On December 5, 1955, American aviation pioneer Glenn Luther Martin passed away. Martin designed and built his own aircraft and was an active pilot. He founded his own aircraft company in 1912 which today through several mergers is amalgamated into the Lockheed Martin company. Glenn Luther Martin was born in Macksburg,…
Heinrich Barkhausen and the Barkhausen Effect

Heinrich Barkhausen and the Barkhausen Effect

On December 2, 1881, German physicist Heinrich Barkhausen was born. Barkhausen discovered the Barkhausen effect (1919), a principle concerning changes in the magnetic properties of metal. With K. Kurz, he invented the Barkhausen-Kurz oscillator, the first vacuum tube electronic oscillator to use electron transit-time effects. Heinrich Barkhausen studied at the Technical…
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