It was thus argued by Thorne that all humans have originated from this initial, single journey.

Anatomically modern humans originated in Africa about 250,000 years ago.

The site (www.becominghuman.org) also explains how fossil evidence is collected and interpreted, and it includes information on the debate over whether humans originated in Africa.

Regarding human origins, Blumenbach believed the first humans had originated in Asia.

The new statistical criticism, he said, did not change his view that modern humans originated in Africa.

"Even if that was proven, it still does not prove that modern humans necessarily originated in Africa."

So the absence of fossils from the west is not enough to prove that humans did not originate there.

We humans just couldn't have originated on Earth.

Some experts believe that humans originated separately on many worlds.

Agassiz claimed plants, animals and humans did not originate in pairs but were created in large numbers.