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TIL using Teflon and other non-stick cookware can kill birds. After new pans are heated for the first time, birds can die within a matter of hours.

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DbAJ TIL jeans when first dyed are yellow due to the yellow color of water soluble leucoindigo, which then oxidizes to the blue color of indigo on jeans.
D1yND TIL Bowling was originally done with 9 pins in America, until 9-pin bowling was banned; so 10-pin bowling was created as a loophole to keep the sport going
69167 TIL Ludwig Van Beethoven's Für Elise was never released in the composer's lifetime, and wasn't discovered until 40 years after his death
6E1pm TIL that Salvador Dalí and Sigmund Freud met in 1938. Dalí started sketching Freud and Freud whispered to his friends: “That boy looks like a fanatic.” The remark, repeated to Dalí, delighted him.
WNxX TIL that on August 7th 1994 in Oakville Washington, mysterious gelatinous blobs began falling from the sky that induced illness in a number of people. The blobs were analyzed by scientists and found to contain human white blood cells with no nuclei. The source of the blobs was never uncovered