> It's the same as a couple of cavemen sitting on a hill talking about thunder as being large rocks falling from a cliff in a faraway valley. Those cavemen are

> It's the same as a couple of cavemen sitting on a hill talking about thunder as being large rocks falling from a cliff in a faraway valley. Those cavemen are doing rudimentary science. They've come up with a testable theory that explains an observed phenomenon of the natural world. If they were to conduct surveys of the cliffs within hearing distance before and after thunderstorms, they'd eventually falsify the theory.