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TIL The sculptor of Mount Rushmore National Memorial, Gutzon Borglum, planned to make a secret room behind the hairline of Abraham Lincoln which was supposed to be a doorway to a chamber originally intended to hold some of America’s most treasured documents but was left unfinished due to his death.

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jGAX TIL IBM’s artificially intelligent computer, Watson, learned to swear using the Urban Dictionary. Later, the Urban Dictionary was removed from its database and a swear filter was installed.
loA9B TIL about the Polish Operation of the NKVD (Soviet security police) in ‘37-38, which was an anti-Polish mass ethnic cleansing operation carried out in the USSR, ordered by the Politburo, resulting in the sentencing of 139,835 people, and summary executions of 111,091 Poles.
By TIL that Saddam Hussein had a daughter named Hala of whom no photographs or records exist, and that her current whereabouts are unknown.
neZvo TIL there is a disease known as "fatal insomnia" which prevents you from ever falling asleep. This leads to hallucinations, panic attacks and eventually, death.
Brm8d TIL that Lone Star ticks can give you meat allergy.