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So far, they're more defined. And these are between around 13,000 years ago. They're

speculation that human beings, as we, the modern human beings, were here before them.

But it's important to establish why cloverous matters. Then it's the tools, it's the hunting

skills, it's the remains of the sites. Is that why we key on that 13,000 years ago?

Now, it really is all those things you mentioned. As you referred to, we do believe we're

pretty convinced, in fact, by a set of footprints found in Southern New Mexico just four or

five years ago that people did get here even before the glacial maximum 23,000 years

ago. But it looks as if their populations were really small. And one of the reasons we

think that is because when the cloverous migration happens, and it happens when the ice sheets

in North America opens sufficiently to allow an overland migration out of Siberia into

what is now Canada and the lower 48 states of the US, when that happens, this migration

takes place with such a rapidity that it implies that there's not really anyone in the way

of us. There's not really anyone that's slowing down this cloverous movement from, all the

way from Alaska to the tip of Tirilfuego, which happens in a space of time of probably

only three centuries. So in what is now the United States and Alaska and Canada, this

cloverous culture is the first human culture that spreads coast to coasts in America.

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