Today the weather is fair. In my science class, I studied sound. It enlightened me very much. In fact, sound is not a thing. Sounds are the waves created by vibrations. They can travel through all media or materials, except a vacuum. Because a vacuum is a void, it means there is literally nothing there. So there are no atoms or molecules, or any tiny pellets (particles?) that can pass through in a wave. It’s a very striking idea, as far as I understand it.