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TIL Keyhole Limpet Hemocyanin (KLH) is a protein derived from the blood of Megathura crenulata limpets and is critical for making medicines. KLH cannot be synthetically made, making the mollusks' serum worth $100,000 per liter.

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grOpD TIL that an unknown 19th century Japanese artist painted a parody of the sacred scene of the Buddha's death that is commonly called the "Penis Paranirvana", in which the dying Buddha is replaced by a giant anthropomorphic penis being mourned by women and other penises.
D166Y TIL that Willie O'Ree, the first black man to play in the NHL, was blind in one eye. It was caused by a ricocheting puck that hit him in the face when he was 18 and he kept it a secret for his entire 21-year career.
E1xnP TIL Austria has an opt-out organ donor system, in which over 99% of individuals are registered donors. Germany's opt-in system has just 12%.
R10w TIL that 18th Century Norwegian swashbuckler Peter Tordenskjold once ran out of ammo during a sea battle so he sent his enemy a letter thanking him for “a fine duel” and asking him to send more ammo so they could carry on. The two crews then toasted each other’s health and went their separate ways.
VMMDk Is the fish's deadly rep justified?