[PIF]

The research builds on prior evidence indicating that Homo sapiens and Neanderthals interbred **only once** over several thousand years (between 43,500 and 51,500 before present, or BP)

—
Their entire theory rest on this one premise - which other “researchers” dispute.

[Ditto]

The research builds on prior evidence indicating that Homo sapiens and Neanderthals interbred **only once** over several thousand years

Wow. Talk about staying power. ;~))