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TIL Hydrogen-alpha solar telescopes work thanks to an optical device called an etalon, made up of two semi-reflective, optically flat plates. The flatness of the plates and how parallel they are defines the quality of the view of the Sun, which has an ‘orange peel’ appearance through the telescope

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v146j TIL that during the Apollo 10 mission a turd was found floating around the spacecraft in zero gravity, but none of the astronauts on board would admit that it was theirs.
lGQG TIL Hans Zimmer wrote the score for Christopher Nolan’s Interstellar based off a one page letter about “what it means to be a father.”
69E58 TIL the cruise ship MS Oasis of the Seas gets a gas mileage of 437 gallons per mile (gpm), or 12 feet per gallon
x6NXb TIL the survivors of a wrecked whaling ship were so afraid of non-existent cannibals on much closer pacific islands that they chose to sail a considerably larger distance. This resulted in only five of seventeen surviving and, ironically, the survivors resorting to cannibalism.
v1kxL TIL that almost ALL “designer” sunglasses are owned by one company, Luxottica. That’s why all the “designer” brands are all “Made in Italy”