The Evidence That Survived by Surviving Challenge

The Paisley Caves story is ultimately a story about what happens when a remarkable claim is subjected to the kind of rigorous, sustained scientific challenge that distinguishes genuine knowledge from unsubstantiated assertion.

The original 2008 claim was remarkable: human mitochondrial DNA, directly dated to before Clovis, from preserved feces in an Oregon cave.

It was the kind of result that could have been dismissed — and nearly was, by critics who raised legitimate concerns about every specific element of the evidentiary chain.

But the researchers who made the original claim did not simply reassert that they were right.