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TIL that skywriting was invented by the Royal Air Force in World War I to send messages to troops on the ground. After the war, Pepsi built a fleet of skywriting biplanes.

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Me1r8 TIL In the 3 volume 2000 page Principia Mathematica it takes until page 86 in Vol.II to prove that 1+1=2, a proof humorously accompanied by the comment, "The above proposition is occasionally useful."
P1nOn Today I learned that it rains more during a whole year in Rome (Italy) than in London (UK).
1J4W TIL in 1964 someone in England bet ten pounds a man would walk on the moon before 1 January 1970, at 1000/1 odds.
WE0A TIL the US has fired a quarter of a million bullets for every 1 insurgent killed in Iraq and Afghanistan.
rN7po TIL a disgruntled employee attempted to hijack and crash a FedEx flight using hammers and a speargun. Despite their traumatic head injuries, one pilot flew the plane upside down while the other grappled with the assailant until he was subdued. Both pilots lived and managed to land the plane safely