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TIL the USMC once used a modified version of DOOM to do simulation trainings

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via reddit.com

PYbmw TIL that Top Gun was produced in collaboration with the Pentagon to rebrand the US military's image post-Vietnam war, and attract new Navy recruits. Top Gun was the first full-blown collaboration between Hollywood and the US military.
1Bg7 TIL that the Russian cosmonaut Sergei Krikalev traveled a 48th of a second into the future. He spent a total of 803 days in space traveling at 18,000 mph, causing appreciable time dilation.
epwn6 TIL that fingernails grow 3 times faster than toenails
VBVOk TIL a primary cause for the e-cigarette or vaping use-associated lung injury (EVALI) outbreak in the US (that claimed 68 lives as of Feb 2020) was identified as vitamin E acetate which was found in certain THC-containing vape products.
Oon9a TIL the last direct heir to Genghis Khan now works as a radio host in the United States