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TIL blood is often red, but also blue, green and clear, depending on how oxygen is transported around the body.

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6E0R8 TIL that UK has started Minister of Loneliness, currently held by Tracey Crouch, after growing consensus that loneliness is a public health concern.
NOXQ TIL of Cardinal von Galen, one of the first public figures to stand up to Hitler. For opposing the killing of the disabled, Hitler planned to kill him after the War.
kJllE TIL in 1969 North Korea shot down a US surveillance aircraft over the Sea of Japan, killing all 31 on board and that the US did not retaliate at all.
Oo9n1 TIL Parents who give their children bleach enemas to cure autism have shared photos of "rope worms" expelled from their children, claiming they are parasites killed by the concoction. They are actually intestinal lining.
xVA4b TIL of Peribsen, an early Egyptian pharaoh whose royal name identified him with the god Seth, rather than with Horus as tradition dictated (particularly strange, since the two gods were mortal enemies). Little is known of his reign, but he's conspicuously absent from later king lists.