After all, electrons are responsible for regular conductivity, being the carriers of electric charge. BCS theory says that at low enough temperatures, the electrons in a crystal lattice will behave cooperatively, a sea of electrons. When temperatures drop even more, though, the electrons began acting strangely. Neighboring electrons then are attracted to the positive charge, and follow along in the wake of the first electron, forming an electron pair. This is so strange because electrons normally repel each other, but apparently enough evidence exists to convince most scientists that the pairings do exist.
Bosons actually induce other bosons to have the same states.
At low enough temperatures, the electron doublets act like bosons, and move in synchronicity through the conductor. No electrons are deflected in the lattice, and no energy is lost. BCS predicted a 23K limit on superconductors, but certain types of material superconduct at temperatures greater than 125K. Phillip Anderson, of Princeton, and Sudip Chakravarty, of UCLA, have come up with a new superconductor theory. Ordinarily, we think of electrons as passing through conductors more or less unbound. The nuclei and other electrons supposedly have little effect on electron movement.