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TIL NASA worked with a company to create a material called translucent polycrystalline alumina (TPA). It was intended to protect infrared antennas on heat-seeking missiles. This material would later be used for invisible braces due to its strength and transparency.

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6E6YZ TIL Chanel's directors were Jewish and that during the Nazi invasion of France Coco Chanel used her position as an "Aryan" to claim sole ownership. The Wertheimers, anticipating the move, turned the control over to a Christian French businessman who, after the war, returned the company to them
95rX TIL that electric vehicles are so quiet that they have systems to generate artificial engine sounds for safety
DK8D TIL three 16-year-old girls were able to cut germination time in half and increase dry-mass crop yields 74% by introducing nitrogen-fixing bacteria to non-leguminous crops like oats and barley. The experiment won them the 2014 Google Science Fair.
VMZ9Q TIL that when Indonesia became independent in 1949, it chose a new red and white flag (????????). Monaco complained bitterly about it, because it was exactly the same as their existing flag (????????). However, Monaco was then not a member of the UN, and was small enough to be ignored
eppXJ TILT there were (twin) pregnancies wherein the more developed kid pumps blood for both the twins (acardiac and cardiac), and the acardiac twin cannot reciprocate it in any way, therefore causing cardiac failure in the developed one.