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TIL the word "penguin" is of Welsh origin, and came into use as a synonym for the great auk, another flightless bird which is not closely related to penguins.

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4ENJ TIL North Korean tunnels exist under the DMZ, apparently designed for a surprise attack on Seoul. 4 have been discovered since the 1970s, but there are suspected to be up to 20 more.
P1npL TIL Virgil Earp (Wyatt Earp's nephew) appeared on The $64,000 question. His category was the Wild West.
4X56N TIL In 1951, Mel Blanc (the voice of most Looney Tunes) accomplished what was then considered to be impossible, when he voiced both Bugs Bunny and Daffy Duck, doing impersonations of each other. According to voice actors, the impressions should have muddled, or the voices straddled one another.
9wkBG TIL you can have a set of identical triplets and fraternal twins (Fischer quintuplets (born 14 September 1963)
myZE TIL that the first person to perform a cardiac catheterization was not allowed to perform the procedure on a patient, so he decided to perform it on himself and then walk all the way to the X-ray room with the catheter still in his arm to prove that the tube had reached his heart.