What's Under My Roof?
It’s possible that one of the first things that distinguished early humans from other great apes was that when it rained they ran for cover while the chimps and gorillas sat out in the open and got rained on. Then, humans started to live in caves and eventually learned to use natural materials such as thatch to cover man-made structures. Now, the modern roof is a sophisticated part of every building. Here are the basic components of a modern roof: