Have you ever sat around a campfire toasting marshmallows and telling stories? Fun, right? But would it be fun if that campfire were your only way to stay warm, cook food, and light up the darkness?
That’s how life was for cave dwellers thousands of years ago. Wood-burning fires were among the earliest forms of energy humans used. But people are clever, and as the centuries rolled by, they found more and more ways to get their work done. Let’s take a look at some of those ways.
