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TIL the idea of black holes was first announced in 1783

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Gra1 TIL Frank Whittle, the inventor of the turbojet engine, wrote: “Good thing I was too stupid to know this” on a academic report stating gas turbine aircraft engines were “beyond the realm of possibility”.
arpJ TIL Argentina and Chile are the only two countries you can “Dig to China” from.
gr6by TIL the RMS Olympic (sister ship to the Titanic) was used as troop transport during WW1 and sank a German submarine
D165V TIL "Hoisted by your own petard" refers to someone being blown up whole trying to plant an iron bell-shaped bomb used to dedtroy gates in the 16th and 17th centuries. I always assumed a petard was a kind of coat...
jNX7p TIL If you visit Luxembourg in late February, you may see burning crosses all over the country. This is an ancient Celtic tradition that has been kept to this day, which is meant to chase away winter and welcome spring.