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TIL in 1923, a Mississippi association developed an influential set of recommendations about street-sign shapes whose impact is still felt today. The recommendations were based on a simple, albeit not exactly intuitive, idea: the more sides a sign has, the higher the danger level it invokes.

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8aNlG TIL, FDR asked singer Eddie Cantor if he could get a million people to send in a dollar to support polio research. He replied that it would be easier to ask for dimes. By the end of the month, the White House had received 2.68 million dimes ($268k) and the March of Dimes began.
R5848 TIL divorce risk goes down if the husband wins the lottery but goes up if the wife wins.
Oyve TIL that in 1972 three men hijacked an American DC-9 and demanded it be flown to Cuba where they hoped to strike a deal with Castro using the large ransom. Instead, Castro had them arrested and returned the aircraft, passengers, and money to the United States.
ANk1w TIL in 1985, the song "Grandma Got Run Over By A Reindeer" gained notoriety at an lowa radio station when a DJ played the song 27 times back-to-back during a morning show. The DJ, who was suspended, was reportedly depressed and upset that a co-worker had left the job.
rRl84 TIL that the "Wednesday Demonstration" in Korea is the world's oldest rally on a single theme. Every Wednesday since 1992, former victims of Imperial Japan's large scale sexual slavery system has been organizing a rally in front of the Japanese embassy, requesting a sincere apology from Japan.