Hi all, I've been told from a couple different people something along the lines of "we don't fully understand how melting (the phase transition) works". Same with superconductivity. But I thought melting was fairly straightforward: The molecules in the material keep gaining energy until they break free from their crystal intermolecular bonds, and then they have some weaker bonds holding them together. I also thought superconductivity was explained by BCS theory. Is there any truth to this? I assume if there is, it's something much deeper and more mathematical, and that we have the general idea but there's still something more technical not understood.