I'm unsure where this is meant to go precisely, so if needed, move this thread where necessary. Our class just touched up just slightly on BCS theory. We were told that conventional superconductors (SC) with Tc<30K were explainable by this theory, while unconventional SC's with Tc>30K couldn't be explained by BCS. My question is - and sorry for the inappropriate nature of it - while the unconventional SC's can be explained by some other theory (I'm assuming) does this mean that it is fairly possible that neither BCS nor this other theory are truly correct? By my logic, there should be one theory that can explain all types of SC's. Any comments?