> There's no proof of any explanation of why Neanderthal and Human would have interbred. Proof? It's everywhere. Nature is mostly highly organized and predicta

> There's no proof of any explanation of why Neanderthal and Human would have interbred. Proof? It's everywhere. Nature is mostly highly organized and predictable, with flashes of randomness. Is this not evolution itself? DNA "accidents" that prove useful (or not) and become dominant (or not). At just 2%, that's within reasonable expectation for random. It could have been higher in certain isolated pockets/communities. Unfortunately, those combinations weren't beneficial or perished for some other random reason (e.g., flash flood), and that evidence is lost in undiscovered fossils.