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TIL that there's a rare blood group called P-null. It is based on the presence of any of three substances known as the P, P1, and Pk antigens on the surfaces of red blood cells.

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pX1G TIL microbiologist Raul Cano, successfully revived yeast that had been stuck in amber for 25 million years. He then co-founded a brewery that uses the same 45 million-year-old species of yeast to brew beer.
4XLd6 TIL that Keanu Reeves gave approximately $80 million of his $114 million earnings from The Matrix sequels, The Matrix Reloaded and The Matrix Revolutions, to the special effects and makeup staff.
N7EP TIL Mike from “Breaking Bad” began his acting career in an education film on menstruation and puberty in the mid-70’s (go to 1:10)
aworM TIL about the Battle of Jumonville Glen, in which a young George Washington ambushed a French Canadian outpost. This became the opening battle of the French and Indian War.
Bg7xW TIL Ernie Hudson, who played Winston Zeddemore in the Ghostbusters movies, was rejected from a role in the Ghostbusters cartoons because they thought he didn't sound like Winston Zeddemore