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TIL that John Glenn, the first American to orbit the earth, spotted a cloud of strange glowing “fireflies” on his second orbit. Later NASA confirmed that the fireflies were simply droplets of his own urine that had been expelled from his craft during his previous orbit.

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6EAB8 TIL that Supreme Court Justice Clarence Thomas spoke a creole language associated with the descendants of slaves called Gullah as his first-language and that his relative silence on the Court is due in part to self-consciousness from being teased about the way he spoke as a child in rural Georgia.
QNDmp TIL that Game Show network had a trivia game show called Inquizition hosted by a man whose identity, as of right now, is still unknown because of stipulations in his contract.
KjW9 TIL Because so many people jumped off the Mapo Bridge in Seoul, Samsung paid to put up signs which would light up and greet people, hoping to deter suicide. Unfortunately, the suicide rate off the Mapo Bridge was six times higher the following year.
kO817 TIL there have been several reported cases of people dying from laughter, including Greek philosopher Chrysippus (279-206 BC), who died from laughing too hard at his own joke about a donkey eating figs and drinking wine.
Oky4 TIL that the rat in James Cameron’s “The Abyss” really was breathing a liquid; there is no theoretical reason that something similar couldn’t be used by humans. (more links in comments)