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TIL English Ivy can cause a rash similar to that of Poison Ivy, and the allergen, falcarinol, comes not only from its leaves, but also the stems and root. It’s not mentioned as often as Poison Ivy and the other Poison variations due to the rashes often getting diagnosed as Poison Ivy interaction.

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Z88vo TIL Paralympic medals have steel balls inside them which, when shaken, makes a rattling sound that helps notify visually impaired athletes to determine between medals.
rR0ax TIL That 'flint' lighters produce toxic 'flint' dust. This toxic dust is visible and appears as smoke when a flint lighter is ignited. Flint dust contains rare earth metals, especially bad when inhaled. Any smoker concerned about their health should use an electronic ignition lighter.
dDMB9 TIL Jason Everman, former Army Ranger and Green Beret, was Nirvana's original second guitarist and can even be seen on the Bleach cover, although he doesn't perform on the album. He later briefly joined Soundgarden as Hiro Yamamato's successor on bass.
JJ91 TIL Sponge bob’s “Bikini Bottom” takes place under a nuclear bomb testing site used in the 40’s called Bikini Atoll (Island at beginning of each episode) Several episodes were made specifically referencing Bikini Atoll, which could mean some characters are results of nuclear mutation. See Production
ynOM TIL Hooters offered employees the chance to win a Toyota. When the winning waitress was given a “toy Yoda” action figure as a prank she sued and won enough to “pick out whatever type of Toyota she wants.”