Loring said his measurements that compare the skulls of people all over the world suggest a resemblance among peoples living in Europe, along the coastlines of Asia and into ancient North America. He also found two distinct groups among the Native Americans. One group physically resembles East Asians, especially modern Chinese, while the second looks a lot like the Ainu. He thinks they may have come from the same lineage as Kennewick Man. Brace has not been allowed to examine the Kennewick remains, but thinks measurements he could make would support his theories.
Some recent evidence tends to support Brace.
In October an international team of scientists tested Neanderthal bones found in Croatia in the 1970s and found them just 28,000 years old, which means they would have lived side by side with modern humans for several thousand years. Although just a few years ago everyone agreed no humans lived in the New World until about 11,000 years ago, and that everyone trekked together over the Bering Strait into Alaska, more and more evidence suggests that people started coming over in successive waves as long as 30,000 years ago. David Meltzer, an anthropologist at Southern Methodist University, noted that huge ice sheets would have blocked any passage from the Bering Strait down through Canada until 11,500 years ago. A settlement in Monte Verde, Chile, has been dated to 12,500 years ago, which suggests people must either have come a different way, or long before the ice sheets formed. Some seem to originate in southeastern Siberia, while one seems to have links with a relatively rare lineage found in a few modern Europeans.