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TIL the House of Grimaldi has ruled Monaco since 1297. By law the reigning Prince or Princess must bear the surname of Grimaldi and until 2002 a treaty between Monaco and France stated that if the reigning Prince failed to leave dynastic offspring, sovereignty would revert to France.

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GYkZ1 TIL that the longest ship ever built was the Seawise Giant, it was 1,500 foot long, it was longer than the Empire State building is high. It had a 36 tonne anchor and it weighed 564,000 tonnes. It doesn't exist anymore and was sold for scrap to a Indian breaking yard.
WD68 TIL In 1964, the inventor Karl Kroyer once filled a sunken ship with 27 million plastic balls to make it lighter and easy to remove. He then tried to patent the idea but failed as examiner found the same method used by Donald duck in a comic book in 1949, 15 years before.
WkbDo TIL that in 2013, an HIV-positive Colombian man was infected with cancer cells from his tapeworm
nEEd TIL that when she was young Marilyn Monroe’s mentally unstable mother tried to kidnap her from her foster parents by stuffing her in a duffle bag.
AN1Bo TIL Joe Rogan credits the Canadian comedian Tom Green for giving him the idea to start a podcast in 2007, when the former was a guest on Tom Green Live!