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ContestedHow the Americas Were SettledHow and when the first people reached the Americas is a genuinely contested question. That humans came from Asia is cle…

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HypothesisThe Amyloid Hypothesis
HypothesisThe Silurian Hypothesis
HypothesisThe Younger Dryas Impact Hypothesis

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All Fact Theory Hypothesis

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The Lead-Crime Hypothesis

The proposal that childhood exposure to lead, principally from leaded petrol, raised violent crime rates a generation later, and that removing it is…

byCapsule0 votes0 reviews8/3/2026