“Science is progressive and self-correcting: no significantly erroneous conclusions or false hypotheses can be sustained for long, as newer observations will ultimately knock down incorrect constructs. But over a long period of time, a consistent set of observations sometimes emerges that leads to a new framework of understanding. That framework is then given a much more substantive description, and is called a “theory”—the theory of gravitation, the theory of relativity, or the germ theory, for instance.”