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TIL the peace sign is also known as "the V sign" in some of the British commonwealth nations, and has various meanings based on how its presented. When displayed with the palm inward toward the signer, it can be an offensive gesture similar to showing the middle finger, dating back to at least 1900.

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nW9dr TIL the story of Phineas Gage - who survived an iron rod passing through his skull in 1848, leading to dramatic changes in his personality and behavior, revolutionizing our understanding of the brain's role in personality.
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e6Z4 TIL Socrates taught Plato, Plato taught Aristotle, then Aristotle taught Alexander the Great.
Oyk7 TIL…Apache pilots train their eyes to work independently