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This is CBS. I on the world. I'm John Batchew. Professor Nicholas Thomas, professor of historical anthropology at Cambridge University, also the director of archaeology and anthropology

museum at Cambridge. His new book is Voyages.

And we plunge into the 19th century and are amazed that a chieftain, significant that he's a leadership position in the Cook Islands, this is Polynesia, is able to direct a European sailing master without use of

European tools. Now we go back to the beginning, beginning, at least until the retreat of the

last ice. This is about 11,000 years ago, and we're not in Polynesia, that's well to the east. We're not in Melanesia.

We're in Formosa, Taiwan now. And the line, the north-south line called Wallasia.

Walasia, forgive my pronunciation professor, what is it that we understand about the voyagers from the mainland into and crossing Wallasia into Melanesia?

There are two stages to this incredible chapter in human history, and it is worth underscoring just how incredible this story is.

Because otherwise, since the beginnings of human history,

since the beginnings of our species,

people have been continent-based.

So they, of course, anatomically modern humans evolve in Africa.

They settle Europe, Asia and the Americas via a land bridge.

...