ELI5: Explain Like I'm 5

Russell's teapot

Russell's Teapot is an idea from a philosopher named Bertrand Russell. He said that there might be a teapot in the universe so small that we can't see it. Even though we can't see this teapot, some people believe it's there. It's like a secret teapot that nobody can find. Russell was using this idea to show that just because someone believes something doesn't make it real.