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https://www.iflscience.com/the-sign-has-been-around-since-1536-so-what-was-it-used-for-pre-internet-83307
ã»Smithsonian MagazineãThe Accidental History of the @ Symbolã
https://www.smithsonianmag.com/science-nature/the-accidental-history-of-the-symbol-18054936/
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