“Why did this advanced and well organized culture, after about 2,000 years of continuous use, bury this huge complex 13,000 years ago? There are no typical signs of war or famine. In fact, thus far, not a single skeletal remain has been discovered” https://www.quora.com/What-are-the-most-fascinating-known-unknowns/answer/Brian-Roemmele?ch=2&share=7c820a21&srid=Pi3 …
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