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TIL that Leonardo da Vinci invented the first glider with directional commands for the pilot. Many attempts have been made to build or model the original idea of Leonardo, however the actual flight potentialities are still unclear. This is last interpretation from the original sketch.

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4gZa TIL that when John Walker used a stick to stir a pot containing antimony sulfide, potassium chlorate & sulfur, some of the mixture stuck to the end of the stick. When he tried to scrape the lump, it easily caught fire (due to friction) & this led to the birth of friction matches.
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