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TIL the pocket calculator, patented in 1967, was one of the earliest uses of rechargable batteries. One of the creators, Jerry Merryman, saw it not just as a pocket calculator, but as an "electionic revolution," bringing buttons, thermal printing, and rechargable batteries to the forefront.

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94rX TIL both Sylvester Stallone and Jackie Chan began their careers in porn.
a65M TIL Tom from Myspace cracked the Chase Manhattan Bank computer system at 14. He was the target in one of the largest FBI raids in California history. He got off because of his age.
n7DB TIL Theodor Seuss Geisel was caught drinking gin with 9 friends in college during Prohibition and was asked to resign from all extracurricular activities. To continue working on his college’s humor magazine he used the pen name “Suess”, which later became “Dr. Suess”.
WkMbY TIL in 1962 two US scientists discovered Peru's highest mountain was in danger of collapsing. When this was made public, the government threatened the scientists and banned civilians from speaking of it. In 1970, during a major earthquake, it collapsed on the town of Yangoy killing 20,000.
8G8L TIL that the “pause symbol” on your remote control is derived from the musical notation called a “Caesura,” which calls for a complete pause in a composition