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TIL That 4000 years old Ancient Babylonian clay tablet which is a customer's letter complaining about sub-standard copper and wanting a refund. It is considered to be the oldest known written complaint.

69NMX TIL that Caesar used the knowledge that the calendar was out of alignment and that it was Autumn instead of Winter and thus safe to sail to beat a blockade and win the civil war against Pompey
OokGa TIL of a lake in West Papua, Indonesia that is filled with jellyfish. These jellyfish have such a minor sting that tourists visiting the island can swim among the jellyfish without any protection. The lake also has a toxic hydrogen sulfide layer that prevents deep diving activities.
aQZZ TIL of Lily Allen’s song ‘Alfie’ which is about her lazy brother and includes the lyric “"You need to get a job because the bills need to get paid”. Today her brother is more relevant than she ever was and is best known for his role as Theon Greyjoy in Game of Thrones.
wLYv8 TIL that Nikola Tesla predicted the modern cell phone in 1926: “We shall be able to communicate with one another instantly, irrespective of distance. Not only this, but...we shall see and hear one another as perfectly as though we were face to face... a man will be able to carry one in his pocket”
7roL7 TIL That J. R. R. Tolkien began work on The Hobbit one day early in the 1930s, when he was marking School papers. He found a blank page. Suddenly inspired, he wrote the words, “In a hole in the ground, there lived a hobbit.”