extreme cold

On mountaintop glaciers of Alaska, Washington and Oregon, billions of tiny black worms are tunneling upward to the barren, icy surface. What lures them, and how do they survive the frozen depths?

Nearly 3 million Texas electricity customers are enduring extreme cold and some cities say tap water must be boiled. One utility says its repair crews have been harassed by angry residents.

As a freezing winter drives many of us indoors, some extreme athletes embrace the cold as a great way to burn calories and retrain the immune system while working out. Not so fast, physiologists say.

From the Dakotas to Florida and down the East Coast, the 'Siberian Express' has much of the U.S. locked in a frigid bear hug.