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TIL that Superstring Theory posits that the universe exists in 10 dimensions with us only experiencing the first 4. The 9th dimension would allow an observer to compare all of the possible universes in history.

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A8og TIL Before Chernobyl, the Soviets had another massive nuclear disaster which contaminated over 20,000 square km. The area was turned into a preserve to cover up the accident. The CIA knew of the accident, but also covered it up in order to protect the fledgling US nuclear industry from hysteria.
QJxb9 TIL: That you weigh less if you visit certain areas of Canada, namely the Hudson Bay Area and parts of Quebec, because there’s less gravity there than other parts of the world.
Z89np TIL that both Ferrari and Porsche declined to provide a sports car for the 1990 film Pretty Woman. They took offense that a prostitute would be in their car. Lotus didn't mind.
E1d5w TIL that when filming Rosemary's Baby, Roman Polanski filmed Mia Farrow walking into real new york traffic. When Farrow was reluctant, he pointed to her pregnancy padding "no one's going to hit a pregnant woman." The scene was shot with Farrow walking into real traffic and Polanski following.
KYgnQ TIL there is a US District (Federal) Courthouse located within Yosemite National Park commonly called the Yosemite Federal Courthouse. The Court handles citations by rangers covering infractions like removing wildlife, improper weapon possession, drunk in public and unlawful hunting.