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TIL The real reason Boeing's new plane crashed twice was mainly due to their business decision to compete with their chief rival, Airbus. Investigators have faulted Boeing and the F.A.A. over how parts of the 737 Max was designed and certified

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x65dk TIL estrogen is responsible for the "masculinization" of male brains in early development. Newborn female mice exposed to estrogen will even go on to exhibit male behavior, such as mounting other female mice. Estrogen also plays important roles in memory, stroke prevention, and overall brain health.
ep5aE TIL During the 1920s and 30s planes still needed to have their propellers spun manually but were getting too large to do it by hand safely. So trucks were fitted with the Hucks Starter device to help start the propeller engine.
lomBV TIL of "Psychogenic death" - when a person gives up on life mentally and dies usually within days. The phenomenon occurs when someone experiences a trauma they feel they cannot escape, and the person views death as their only option.
4kdMw TIL: One scientific theory suggests that the passage of time is due to our expanding universe. As the universe expands, it pulls time with it because space and time are linked as one. So if the universe were to stop expanding and begin to contract, then time would reverse
DWVv TIL in 1991 the tallest structure in the world at the time (a radio tower in Poland) collapsed due to poor maintenance. No structure exceeded the height of the collapsed Warsaw Radio Tower until the Bujr Khalifa was completed in Dubai nearly two decades later.