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TIL of The Silurian Hypothesis, which is a thought experiment that assesses modern science's ability to detect evidence of a prior advanced civilization, perhaps several million years ago.

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D1AOj TIL George Lucas made Steven Spielberg a bet that Close Encounters of the Third Kind would be more successful than Star Wars and agreed to give each other 2.5% of their film's net points. By 2014, it was reported that this deal made Spielberg an estimated $40 million.
9YbVM TIL director John Landis (Trading Places, Blues Bros, American Werewolf in London, etc.) has a recurring gag in most of his films, referring to a fictional film that seems to be completely different every time it’s depicted.
yQLva TIL that the sale of condoms in the colours of the Australian Aboriginal flag won a public health award in 2005 for the initiative's success in improving safe sex practices among young Indigenous people.
E1VLx TIL according to studies, highly processed foods share pharmacokinetic properties (e.g. concentrated dose, rapid rate of absorption) with drugs of abuse, due to the addition of fat and/or refined carbohydrates and the rapid rate they're absorbed into the system, indicated by glycemic load.
PY0Xe TIL During the Korean War, after failing to weaken the Chinese forces through attrition, the United States carried out the most concentrated bombing campaign in history which killed over 20% of North Korea's population and thoroughly wiped out "every city, down, village" in the country.