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TIL in the US radio-controlled clocks precisely coordinate time shifts with the official atomic clock at the Physical Measurement Laboratory in Boulder, Colorado. The atomic clock keeps time for the entire country and will neither gain or lose a second over the course of 100 million years.

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KYlaw TIL that then-Congressman and future Vice President Dan Quayle was invited to investigate Jonestown with fellow Congressman, Leo Ryan, but declined. That declination ended up saving his life, as Ryan was later assassinated in Guyana.
R571Q TIL that Gift cards from Big Companies expire because of the accounting problem. Companies like Amazon, use accrual accounting. They enter the value of the Gift cards that are sold as Liabilities, specifically "Prepaid-Sales" Liability which affects their Revenue. Hence they have "Service Charge".
M7QEW TIL In the original Back to the Future script, Doc’s time machine was a refrigerator strapped to the back of a pick-up truck.
R7AL9 TIL In 2018, Massive Attack encoded an album into synthetic DNA to mark it's 20th anniversary. Spraycans were made with the DNA encoded audio within matt black paint, each can containing approx a million copies of the album
N7A5b TIL the 'Butterfly Effect' can be traced back to a short story called 'A Sound of Thunder', written by Ray Bradbury in 1952.