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TIL when Germany invaded Denmark in WWII, George de Hevesy used aqua regia to dissolve 2 golden nobel prize medals from Laue and Frank, to prevent nazis from conviscating them. After the war he precipitated the gold out of the acid and the nobel foundation recast the medals and gave them back.

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JYJ8j TIL that Queen Elizabeth has two birthdays: her actual date of birth and her "official" birthday. On her official birthday she is joined by members of the royal family for the Trooping the Colour parade. Btw, Happy actual 94th Birthday to the Queen today!
XO5k TIL there was a service dog named Endal, who, in 2001, rescued his unconscious owner by putting him in the recovery position, covering him with a blanket, retrieving his mobile phone, and running to a nearby hotel to obtain help after his wheelchair was clipped by a vehicle.
0Y1L TIL: Some gay Christians identify as “David and Jonathan”. The two Biblical warriors formed a covenant bond, with later David lamenting he loved Jonathan more than any woman. The relationship was used to support gays serving in the Israeli military.
loEVN TIL Oregon had the only state-sponsored rock festival in United States history, Vortex I. It was an elaborate ploy to lure young people away from Portland during a planned visit by President Richard Nixon.
eYME TIL Americans spend nearly $400 Million on Halloween pet costumes each year