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TIL Less than one percent of the worlds shipwrecks have been discovered with an estimated 3 million ships lying on the ocean floor.

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4VEw TIL in 1933, a Japanese School Girl committed suicide by jumping into a volcanic crater on the island of Oshima. This act started a bizarre trend in Japan, and in the following year 944 other people (804 men and 140 women) leapt into the same crater.
yQrna TIL Avatar's infamous "sex scene" wasn't part of the original Theatrical Cut
MeyVB TIL a shark at a New Zealand aquarium was discovered to be pregnant when another shark attacked her and 4 baby sharks emerged from the open wound. Staff were surprised and found 4 more babies in her. If she’d given birth at night, then her babies would have been eaten alive by other sharks.
4k1lJ TIL in the 1970’s, a shipment company was denied a loan needed to keep the company afloat so the owner took their last $5,000 to Vegas. Playing Blackjack, Fred Smith ended up with $25,000, which was enough to cover the fuel bill and keep FedEx going for another week.
6el TIL that in 2007 Checkers was “solved”. That is, given perfect play, the win/lose/draw result for every possible game is already known.