How did Ice Age people stay warm and find food?

Picture the world tens of thousands of years ago, when winters were longer, colder, and meaner than anything you've shivered through. Glaciers crept across whole continents like slow, frozen tidal waves. And right there, breath fogging the air, lived people exactly as clever as you. The question is: how on earth did they keep from freezing — and from going hungry?
First trick: wear the animal. Ice Age people didn't have factories spinning cozy fabric, so they made warmth out of what the land gave them — thick animal hides. A fresh hide is stiff and smelly, so they scraped, soaked, and softened it by hand until it turned supple as a winter coat. Layered fur-side-in, it trapped a pocket of warm body-heat right against the skin.
