Imagine you are living approximately 20,000 years ago. You shiver with cold as you huddle in a dark cave, covered by reindeer or bison skins. As you take a peek out at the frozen surroundings, a terrifying thought hits you—the possibility that you might have to share your shelter with a cave lion or cave bear.
Your teeth chatter and your stomach growls, and you can’t stop wondering when the hunters will come home with fresh meat. The cave’s only heat is generated by a fire that burns and smokes all day and all night. It was a harder life than the typical American’s life today, no question. But the good news is that you can explore the Ice Age warmly and safely from the twenty-first century. No need to bundle up.
