Imagine you are living some 20,000 years ago. You are huddled in a dark cave, covered by reindeer or bison skins. As you peek out at the icy surroundings, you worry that you might have to share your shelter with a cave lion or cave bear.
Your teeth chatter and your stomach growls, and you wonder when the hunters will return with meat. The only heat comes from the fire that burns day and night. It’s a harder life than your life today for sure. However, you can explore the Ice Age warmly and safely from the twenty-first century. No need to bundle up.
