Are you certain that the law of gravity is really a law?
David Hume · 2021
Do you have a pencil or pen in your hand? If you do and you let go of it, what would happen? Well, that’s the easiest question in this book! The pencil would fall. Why? That’s easy, too: Gravity causes it to fall. Simple, eh? But change the question a bit: Are you certain that the pencil will fall? Of course! Why are you certain? Well … because the law of gravity is a law. But, why are you certain that the law of gravity is a law?