To most people, and sometimes myself, the world tends to be content with itself. Really, it isn't. It'll probably take a while for you to realize it, but the world is changing drastically. Back when there wasn't any humanity, up to now, the world has changed a lot. With humanity came technology.
Technology has a great input on changing the world.
Nowadays, you can do just about anything without using your hands. Instead, you can use special machines. You can do even more things with the touch of a keyboard. To be a little more exact, there weren't any computers. There wasn't any indoor plumbing.