What Is Science?

Carl Sagan famously defined science by saying, "Science, more than a body of knowledge, is a way of thinking." How do you define science?

Whether your definition is borrowed from someone else or one you crafted on your own, whether it's a quote, an illustration, a joke, an experiment, or just a way of defining it that makes sense to you, whether it's pithy or long-winded, tell us in the comments: What is science?

Image: Artist's concept of Voyager in flight / NASA-JPL.