As I understand it, the scientific method turns upon the notion of the inductive translation of the results of an experiment to the creation of a general hypothesis or theory. A problem of induction is that conclusions drawn from observations, no matter how many, will always be demonstrated to be false, or as Popper illustrates the point, “no matter how many instances of white swans we may have observed, this does not justify the conclusion that all swans are white”, thus whilst scientific method can be used to prove the case in hand, while this cannot be used to prove the general case, it does enable the elimination of falsity. So, where does this concept of proof exist in the realm of original thought - yes experimentation is necessary to demonstrate false hypothesis, but the joy of science (for me) is the exception to the apparent rule that reminds us that reality isn't simple - after all its not that long ago that good old Sir Isaac thought that he'd wrapped it all up and he could give up and play golf! So, unless you have proof that Odin's lack of central heating isn't a contributing variable to the colour of the sky, then I say its a valid topic of discussion... or do you know that all swans are white?
Btw... didn't Popper also say that a scientific hypothesis must be refutable by experiment to be valid...? I'm just thinking about all those poor social 'scientists'