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TIL that bananas are naturally radioactive due to potassium-40, and the small radiation they emit is so well-known that scientists use the "banana equivalent dose" as unit to explain everyday radiation exposure. Looks like bananas are used for scale in more than one way!

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9wOp6 TIL that the original lyrics to “Have Yourself a Merry Little Christmas” were much more depressing. The lyrics were changed because Judy Garland refused to sing those lyrics to a child. The lyrics were then changed once more because Frank Sinatra wanted the song to have a more positive tone.
YpDDZ TIL That in Iceland, Elves (called Huldufólk) are such an important part of Icelandic folklore, that several building projects have been altered in order to not disturb their homes.
VMYxZ TIL on October 5, 1892 the Dalton Gang rode into Coffeyville, KS, and attempted two simultaneous bank robberies. Townspeople recognized the outlaws and surrounded the banks. All gang members were shot and killed except for Emmett Dalton, who served 14 yrs in prison and then became a Hollywood writer
0wBwR TIL of Squirrel Girl, a Marvel superhero who has a furry tail, lips that tastes like hazelnuts, and has "nutsacks" -- a utility belt with nuts for her squirrel friends.
grOY9 TIL the tallest building in Vermont is 11 stories