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Ancient creatures survived arctic winters

Tropical turtle fossil found in Arctic

When did people first come to North America?

Most Indians linked to 'founding mothers'

Massive meat-eating dinosaurs discovered

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  Women driving Porsche sales

In the last two years, Porsche sales to women have doubled in North America, reports CNBC's Phil LeBeau.

  Frisky frogs wake and mate on 'North America'

They're alive! They're also ready for action. After a long nap in the dry Arizona sand, hundreds of spadefoot toads reanimate on Sunday's new episode of "North America."