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TIL of an attempted plane bombing in 1985 where the bomb went off an hour early, while still in the airport. The perpetrators did not realize that Japan does not observe daylight saving time, so the bomb went off before it made in onboard.

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78aO TIL the blind get a 50% discount on TV licenses in the UK
1gVD TIL- The new Navy laser weapon system costs less than a dollar to fire and never missed a target in testing, making it the most effective and cost effective weapon the Navy has available.
rODo TIL in an attempt to curb petty crime among police officers, the officers were threatened with having to wear a Hello Kitty armband as a mark of shame (from Now I Know).
R7w1 TIL in the 90s scientists tried to create an artificial biosphere in the desert which ended up a massive failure crawling with crazy ants.
rN4Qx TIL that the first use of an external defibrillator was on a 14-year-old boy in 1947. These early defibrillators used alternating current that was transformed from 110–240 volts available in the line, up to between 300 and 1000 volts, to the exposed heart by way of "paddle" type electrodes.