Well, the rest of the article is certainly worth reading for context, especially this part:
SIGNIFICANT DIFFERENCES
In fact, Klein contends, DNA extracted from Neanderthal bones shows that the last shared ancestors of the Neanderthals and modern humans lived in Africa at least 500,000 to 600,000 years ago.
There are other major differences, too: Cro-Magnons were the first to produce arrowlike projectiles tipped with ivory and amber, while Neanderthal weapons were only wooden spears sometimes tipped with stone points, Klein says.
The Cro-Magnons also made figurines and created objects of bone, an ability the Neanderthals apparently largely lacked, he says.
As the Cro-Magnon people became more advanced, they learned to build the first true houses, Klein says. By contrast, archaeologists have found only one example where a Neanderthal may have constructed a crude house -- perhaps merely by imitating a Cro-Magnon dwelling, he says.
Except for that one Neanderthal house at a site in central France, "there is little to suggest that Neanderthals could behave in a modern, Upper Paleolithic way," Klein says, referring to the period in which Cro-Magnons thrived. That may well explain why Neanderthals disappeared so quickly and completely, he says.
Then there is the question of language: A recently discovered human gene, called FOXP2, is involved in the human ability to use speech and language. Chimpanzees -- humans' closest animal relatives -- don't carry that gene, but Cro-Magnons may have.
GENES' UNANSWERED QUESTION
Although Wolpoff insists that the bone structure of Neanderthal fossils indicates they too could have been capable of voicing sounds, whether or not they did would become clear only if the FOXP2 gene is ever found in a sample of DNA remaining inside a scrap of Neanderthal bone.
"The main question that remains open," Klein says, "is whether Neanderthal genes explain their failure to compete culturally."
Klein has at least one major ally in F. Clark Howell of UC Berkeley, an eminent paleoanthropologist who has traced human evolution from its beginnings 7 million years ago to the relatively recent rise of the Cro-Magnons and the swift extinction of the Neanderthals.
"I couldn't find a single word in Klein's paper that I could disagree with, " Howell says. "It's a superb piece of work. He's summed it all up with the strongest possible evidence -- both for the known and what's still unknown."
The part of the paper that had rehashed what seems to be accepted knowledge--I left out since it was already (in one form or another) mentioned. For me, the key was the evidence of the mixed fossil boy found in Iberia and Wolpoff's comments.