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TIL about Calixa Lavallée a Canadian who fought for the Union in the American Civil War. He later went on to compose the music for “O Canada” the Canadian national anthem. 33-55,000 Canadians fought for the Union in the Civil War.

YpANB TIL of Castle Infinity, a video game that was shut down in 2000 but was brought back when the servers were recovered from a dumpster by a former player and programmer, who established a new development team and relaunched the game online.
a8WJ0 TIL: Meowing is an interesting vocalization in that adult cats don't actually meow at each other, just at people. Kittens meow to let their mother know they're cold or hungry, but once they get a bit older, cats no longer meow to other cats.
x6pLo TIL that During World War II, the Quaker Oats company , through its subsidiary the Q. O. Ordnance Company, operated the Cornhusker Ordnance Plant as a government-owned, contractor-operated 11,960-acre site that manufactured millions of pieces of various artillery munitions.
9YVjX TIL that among starfish that can regenerate their entire body from a single arm, some can do so from just 1cm (0.4in) long and in some species of starfish, a large female can split in half, each half becoming male which changes back into female once they grow big enough.
ADPAa TIL the "Einstein refrigerator" is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd, who patented it in the US on 11/11/1930.