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TIL a pilot landed a F-15 with only one wing left.

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WMnB TIL that punchcards were used to ‘program’ looms to weave elaborate textiles in 1725.
OKw6 TIL of Positronium, a nearly massless element made out of a meta-stable mix of matter and antimatter with no protons or neutrons. It can even form chemical compounds such as Positronium Hydride. When it does collapse, it releases pure energy as flash of gamma radiation, leaving nothing behind.
YpJMv TIL that during first lunar landing Neil Armstrong and Buzz Aldrin were literally lost for the duration of being on the Moon. Neither NASA nor Michael Collins from Columbia module orbiting the Moon were able to locate the landed Apollo 11 for 22 hours it remained on the surface.
X4p8 TIL that a commercial 1989 laptop had a multitasking graphical OS and full office suite, SSD storage and a 60 hour battery life as well as featuring hot-swappable batteries and instant suspend/resume.
N7V1E TIL in 2003 unknown Russian mathematician Grigori Perelman proved the long awaited Poincaré conjecture publishing it openly. He is the only person to reject Fields Medal, Clay Millennium prize of $1,000,000 and EMS prize. He has since vanished back to obscurity.