How do eskimos keep them warm?

By having central heating. By the way, the Word "Eskimo" is considered a mild racial slur by the Inuit.

And please, no one repeat that stupid line about food being put in a refrigerator to keep it from freezing. I know it is a good test of gullability, and a fine way to see if a person has any concept of science, engineering, or common sense, but it just isn't funny anymore.