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This is CBS Eye on the World.

Here's John Batchelor.

This is CBSI on the world. I'm John Batchelor.

66 million years ago, North America, all North America divided into three parts.

Appalachia, the Mid-Continental Waterway,

the interior waterway, and La Ramidia.

This is the basis to begin a conversation

about wild new world, a new book from Dan Flores,

the A.B. Hammond Professor Emeritus of Western History at the University

of Montana. And what Dan takes us is a time travel from 66 million years ago and the asteroid that

changed the direction of evolution to the period of time that we're living in now called the Anthropocene

passing through a very important detail from 10,000 years ago called the Pleistocene.

This is the story of mammals chiefly, but also the story of one kind of mammal.

That's us, the Homo sapiens, the hominids who arrived twice,

first from Eurasia thousands of years ago, and then second from Eurasia again within our memory,

the so-called colonial Eurasians. Dan, a very good evening to you. Thank you very much,

and it's a pleasure to speak to you because of the sweep of your story,

...