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TIL Space Shuttle Discovery has a unique “teardrop shape” on its windshield tiles due to an unusual and unknown error.

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OGo5X TIL there is a species of bird that has only been found once. A Red Sea Cliff Swallow was found in Sudan in 1984, and a second bird of this species has never been found. There is not enough conclusive evidence to say it matches any other species of swallow, so it is still listed as its own species.
xVN41 TIL Glass actually neither a liquid—supercooled or otherwise—nor a solid. It is an amorphous solid—a state somewhere between those two states of matter. Glass atoms move too slowly for changes to be visible.
4pNR TIL Google provides the number for the Suicide Prevention Hotline when presented with the search terms “i want to die”
xXGk TIL People who drive Hummers get 5 times more tickets than a regular driver
xVKLo TIL 40% of women admit to having felt same-sex attraction, while only 14% of men admit the same.