This is CBS. I'm the world. I'm John Baxter. Hope to tell Mars.

Episode N, David Livingston, Dr. Space of the Space Show, is here.

And we're traveling 12,000 years before President.

To Chile, to the high desert of Chile, call the Atacama Desert.

And our guide is Professor Peter Schultz,

speech professor emeritus, Brown University's Department of Earth,

environmental and planetary scientists. The professor assures me,

there is very like the good likelihood that human beings have

settled in this area 12,000 years before right now,

along with other megafauna. And then one day,

Professor, a very good evening to you.

Your presentation is as exciting as the passing of the dinosaurs.

What is that that you're presenting in geology magazine

that is very likely to have been an event that left very few signs

except yours 12,000 years ago and this moment in Chile.

Good evening to you, Professor.

Good evening. Nice to be here.

And the event. Can you describe that moment, Professor?

What's your thing happened?

Well, we think, somewhere between 11,500 years ago

and 12,300 years ago,

there was one of these events soon that was just striking.

...