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TIL the juvenile form of the yellow boxfish is dazzling bright yellow, but this color fades away in adulthood. It is found near ocean reefs. When attacked, this fish releases a neurotoxin from its skin that can be lethal to predators. The fish's box shape inspired Mercedes-Benz's Bionic concept car.

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DAgD TIL some words have no (or very uncommon) positive forms. Examples: disgruntled, incognito, feckless
YpkYG TIL that during the 80’s, drunken calls to Hanna-Barbera studios from Flintstones fans curious to know what Barney Rubble did for a living were so common that the security guard in charge of answering the phones at night would simply reply: ‘‘ He worked in the quarry’’.
GYGQ TIL NASA set out to disprove the claims of the “Mayan Apocolypse”, and did.
VMd9m TIL that Maillard reaction is responsible for the colours / flavours of french fries, steaks, dumplings, cookies, toasted marshmallows & more. Described first in 1912, it is a chemical reaction b/w amino acids & reducing sugars and based on constituents, it can result in 100s of flavours.
ykdM TIL: A fox shot his hunter in Belorussia(now Belarus). The man tried to finish off the fox with the butt of his rifle, but the fox pulled the trigger with its paws, wounding the man in the process.