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TIL that rats laugh when tickled, but the sound is at a frequency humans can’t hear without special equipment. Scientists discovered this in the late ‘90s.

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via reddit.com

WkJjL TIL In 2014, black taxi cab drivers brought parts of London to a standstill, protesting against Uber. This led to an 850% increase in downloads of Uber.
neWZ7 TIL that ABBA's "Dancing Queen" is a favourite of Queen Elizabeth II. She claims: "I always try to dance when this song comes on, because I am the Queen, and I like to dance."
VB54p TIL about the Stelae of Nahr el-Kalb, a series of inscriptions from several conquerors from Egyptian times to Lebanese independence
j6nWR TIL FDR signed the most executive orders out of any President in American history, with a total of 3721. The second closest is Woodrow Wilson who signed 1803 executive orders. Wilson was the President during WWI, while FDR was the President during the majority of WW2.
9Ypy7 TIL Daniel David Palmer, the father of chiropractic maintained the notion and basic principles of chiropractic treatment were passed along to him during a seance by a long dead doctor. Before learning of spinal adjustment from a supernatural entity, he was also a magnetic healer.