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Therefore, one can assume that the entire lead content of the zircon is radiogenic, i.e.

it is produced solely by a process of radioactive decay after the formation of the mineral.

There is solid archaeological evidence for human occupation near the Bering Strait 14,000 years ago.

I like seeing that process in action over specific claims, especially when the claim itself is interesting.

One such interesting question is, what was the earliest human presence in the Americas?

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