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TIL that a medically sound symptom for having a mismatched blood transfusion is an immediate sense of impending doom.

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0Vv5 TIL: Any dolphins or whales that are caught within 3 miles of the UK are considered the personal property of Queen Elizabeth
5VO88 TIL about Multiocular O (ꙮ), a rare glyph variant of the Cyrillic letter O. Only one single use of this glyph is know, in a 15th century manuscript, in the Old Church Slavonic phrase "серафими многꙮ҄читїи"
4XOp6 TIL that an 800 sq. mile region on the border of Egypt and Sudan, Bir Tawil, has a terra nullius status, meaning no country claims the land and has no laws.
1aNQX TIL that Pluto is so cold that it's covered in frozen Nitrogen ice. About 800,000 years ago, it may have been warm enough to have liquid Nitrogen flowing across its surface in lakes and rivers.
DQX1r TIL that until infant pain was formally recognized in 1987, it was widely assumed that infants didn't feel pain, leading to many undergoing major surgeries without anesthesia.