Yeah, IMHO apart from using combinatorial enumeration, that's how most of progress in physics happens. You start with an idea and see to what it applies. When y

Yeah, IMHO apart from using combinatorial enumeration, that's how most of progress in physics happens. You start with an idea and see to what it applies. When you search for a theory of everything, you try to apply it to everything you know. If it applies to many different things, you may be on the right track.