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TIL Siegel and Shuster created Kryptonite in 1940, in an unpublished Superman story 3 years before it appeared on the radio show. DC Comics rejected the story because among other things Superman revealed his secret identity to Lois, causing their relationship to change and upsetting the status quo.

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0w7jN 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.
5V0OP TIL Harry Houdini died on Halloween in 1926.
VMJG8 TIL that TV stations in Montana and Michigan were hacked in 2013 to broadcast bogus emergency alerts about zombies. The Montana alert said "the bodies of the dead are rising from their graves and attacking the living." The Michigan stations said the hacks were traced to "an overseas source."
408N TIL Outdoor temperature can be determined by counting the chirps made by crickets. To convert chirps to Fahrenheit, count number of chirps in 14 seconds then add 40 to get temperature. The formula endorsed by The Old Farmer’s Almanac.
rRJZ1 TIL of Iron Age pigs, a cross between wild boar and domestic pig, first developed for a BBC documentary to mirror the type of pig represented by prehistoric art works of the Iron Age in ancient Europe. They are now raised for their meat with a distinctive gamey pork flavour.