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TIL When German troops invaded Austria in 1938, they were actually greeted by thousands of hailing and cheering citizens, swastika flags, and even saluting frontier guards.

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mxg6p TIL about Hoover, the talking seal. He first learned to vocalize from the human family who saved him and his accent reflects their New England speech. Additional sources in the comments.
X04bR TIL in 2022, the US created the 'American Song Contest', based on Eurovision. It failed due to the "the relative homogeneity of the American musical landscape," and the fact that Americans were not campy enough to capture the magic of Eurovision.
AyOx TIL that pepperoni is an American invention
kJGW4 TIL "Murphy's Law" originated during rocket sled tests that took place in 1948-49 at Edwards Air Force Base in southern California, and is named after USAF Captain Edward A. Murphy. Murphy went on to make crew escape systems for the F-4, SR-71, B-1 and X-15.
wowYP TIL that Machu Picchu is earthquake resistant. The Incans created an engineering technique called ‘ashlar masonry’, where rocks are cut to fit perfectly together without mortar. This allowed the stones to move in its place during an earthquake, before settling back in their original positions