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Pythagorean Theorem Found On Clay Tablet 1,000 Years Older Than Pythagoras
(www.iflscience.com)
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I recall there was at least one location which was 3D scanned and photographed in detail before ISIS destroyed it, so at least not all of it is lost.
https://www.fastcompany.com/3052498/these-3d-scans-are-digitally-saving-ancient-monuments-before-isis-blows-them-up
https://apnews.com/general-news-travel-arts-and-entertainment-dbca5e23519f44c4a881c9cd69f41cd6