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TIL Allvar Gullstrand applied the methods of physical mathematics to the study of optical images and refraction of light in the eye and received the Nobel Prize in Medicine in 1911. Due to the math in his works, it is lamented there are few ophthalmologists and physiologists who can understand it

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R5BBw TIL about “parasite singles,” a Japanese term for unmarried adults living with parents into their 30s for comfort. This trend contributes to delayed marriage and low birth rates. Similar terms exist globally, like Italy’s “bamboccioni” (“big spoiled babies”) or Brazil’s “Paitrocínio.”
loKN7 TIL that MDMA (aka ecstasy) can help alleviate PTSD, even after taking it just once or twice. In a 2018 study, 100% of participants showed reduced symptoms of PTSD one year after the trial. 67% lost their PTSD diagnosis altogether.
X01jP TIL The first mid-air refueling occurred in 1923 by the US Army Air Core between two bi-planes.
e0By5 TIL that during the Cold War, Chairman Mao held meetings in his swimming pool to embarrass Nikola Khrushchev, who had to wear a floaty as he couldn’t swim. Khrushchev felt insulted and the incident furthered the deterioration of relations between the Soviet Union and China
nWaRP TIL of Juan Pujol García, a Spanish spy from WWII. After the British Army turned him down, he joined the Nazis, and became a double agent, working for the British. Juan is now one of the few people who have received both an MBE from King George and an Iron Cross from Hitler.