Why no "speculative" posting Can someone please explain to me the reason why PF prohibits the discussion of unsupported scientific theories? To me, it seems as that such a rule significantly limits what one can learn based on the feedback of others through a much more diversified knowledge background. What's the harm in speculating about the existence of extra dimensions? At one time something as simple as F = ma would have been speculative to discuss. I guess there may be other smaller communities out there where such discussion is regarded as appropriate, but none of those forums have close to the knowledge base of PF. Anyways, some clarification beyond what is in the community guidelines would be much appreciated.