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The White Sands (New Mexico) human footprints date to ~21,000–23,000 years ago, establishing human presence in North America during the Last Glacial Maximum, well before Clovis.
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The Giza-area pyramids were built using a now-vanished branch of the Nile (the Ahramat Branch) as the primary transport route for heavy materials, with stones moved by boat and human-powered sledges/ramps rather than any lost or exotic technology.
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