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TIL that the word "second" (time) and "second" (placement) are the same, as it is the "second" division of an hour. Medieval sources show potential usage of "third" and "fourth" as well.

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m1Lvy TIL A parasite of the Greenland shark is Ommatokoita elongata. This copepod attaches itself to the eyes of the shark causing lesions which cause impaired vision and even blindness. Usually, only one eye is affected by a single copepod. Some believe that the copepod attracts prey for the shark.
ne8nP TIL that the Inquisition still officially exists, but in 1965 was renamed the Congregation for the Doctrine of the Faith
4kBlo TIL about Neils Bohr's Gunslinger Effect, which shows that for many competing actions (like two Western gunslingers drawing a gun) the reactor acts faster than the first actor
gMBV7 TIL Bill Gates hijacked the control panel at an airport gate -- and got the plane to come back.
e0dGn TIL Czech hospital kept brain-dead mother 18 weeks on life support and prepeare her to gave a successful birth. It's one of the longest time ever