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