Re: Were Neanderthals really stupid?
A few other things I gleamed from a documentary about them (so decreasing the credibility) was they lacked the ability to verbalise as well as sapiens (they couldn't produce the same range of sounds) giving them inferior communication abilities and didn't organise themselves into groups as large as human ones. They had much bigger occipital lobes than humans so they're presumed to have better eyesight, though that seems like a bit of a phrenological conclusion.