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TIL it used to be common for woman in the US to wear extremely long metal hatpins but in 1910 hatpins longer than 9 inches were banned because woman were using them for self-defence and/or accidentally killing people with them.

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0w0KN TIL award winning film critic Roger Ebert created the Boulder Pledge. A commitment to never buy anything offer from spam email or to forward spam or chain emails.
7rVeb TIL: In 1947, the Superman radio show did a series called "Clan of the Fiery Cross" in which they exposed many of the KKK's most guarded secrets. Within two weeks of the broadcast, KKK recruitment was down to zero. And by 1948, people were showing up to Klan rallies just to mock them.
N7OLE TIL About "Flarf Poetry." An unconventional and loose form of poetry that utilizes the the Internet to scavenge and conjure up odd and unordinary words or phrases to be implemented in a flarfy marlarky, sometimes horrifying, poem.
yQgbp TIL the hottest hot sauce in the world is “mad dog 357”, it clocks in at 9 million on the scoville hotness unit scale. For comparison, pepper spray clocks in at around 5.3 million scovilles. Oh and it comes in solid form and literally needs to be heated to 140°F to be even used
nWDZP TIL of German psychologist Hermann Ebbinghaus. He created a list of nonsensical words to test his memory. He demonstrated that increased repetitions led to increased retention, graphing the relationship in what would be known as the learning curve.