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TIL about Project Excalibur, a sub-program within the US's Strategic Defense Initiative that intended to provide defense against ballistic missiles in the most abysmal way imaginable: Anti-ICBM Nuke Blast X-Ray Laser Beams

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nWGYo TIL Childlore is the unique culture of children, including rhymes and games, learned and passed among peers. Often unnoticed by adults, it is conservative, unlike evolving adult folklore, and fades with adolescence.
kOZp1 TIL about Jerusalem Syndrome, an acute psychotic disorder which causes some people who visit Jerusalem to slip into a psychosis and believe they’re a biblical figure
WQV9 TIL that Hitler justified his campaign of ethnic extermination and relocation in Eastern Europe and the USSR in part on the U.S. government’s treatment of Native Americans in the 19th Century.
Lk98r TIL the NASA cameras that tracked Apollo rockets were built off of M-45 quadmount anti-aircraft gun systems
16XBD TIL that Terri Nunn, singer of Berlin, was asked to merely perform temp-vocals for "Take My Breath Away" for the Top Gun soundtrack, but the producers loved her performance so much, it was pushed to be Berlins next single, despite no other member of Berlin writing or performing on the original song