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TIL that the term “public relations” was invented by E. Bernays because the term “propaganda” was in misscredit due to the nazis use of it.

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e0LyJ TIL that Leonardo da Vinci received complaints about his procrastinating from one of the priors while painting The Last Supper. He solved the argument by threatening to use that particular prior as the model for Judas in the fresco. The complaints stopped shortly after he made this remark.
yQ6Gp TIL the closest living relatives of all animals are a group of single-celled organisms named the Choanoflagellates. We're far closer to them than we are to plants
ePon TIL a Y2K bug caused mothers’ ages to be calculated incorrectly, leading to 154 faulty Down’s Syndrome tests being sent out, which in turn led to two abortions and four failures to discover the syndrome.
ZpenY TIL that sometimes, but very rarely, you may catch a radio broadcast from your teeth fillings or braces.
l7d8G TIL that the Achaemenid Empire is named after Achaemenes, who was likely fabricated by Darius I in order to justify his usurpation of Bardiya, the legitimate scion of the Persian imperial dynasty, and his own enthronement, despite having no familial connection to the Persian dynasty.