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TIL there are four sunken nuclear submarines at the bottom of the Atlantic Ocean. One, located near Bermuda, holds sixteen live nuclear warheads.

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via reddit.com

GjPG TIL the existence of the BT Tower used to be an official secret. It was 189 metres tall, located in the centre of London, and had a rotating restaurant that anyone could visit. It did not appear on maps and was not officially acknowledged until 1993.
911D TIL a guy upset with his then girlfriend for not properly mourning his father’s death hatched a plan to marry and conceive a child and then kill it later after the wife had bonded with it. He was convicted for murdering the 7 month old.
LklO0 TIL of conjoined twins who share a brain stem. When one is tickled, the other jumps, and putting a pacifier in the mouth of one could cause the other to stop crying. There is evidence that the twins can even see through each other's eyes.
6EJjX TIL a medical theory which holds that the human appendix serves as a storehouse for good bacteria, and helps to "reboot" the human digestive system after a chronic or short term diarrheal sickness
9YB8M TIL that in Mongolia, scientists discovered a fossil of a prehistoric creature known as a "Murder Swan," which had a bill with teeth, claws on its feet and additional claws on flipper-like arms.