I found this website by a guy named David Sligar: http://www.geocities.com/Area51/Shire/3075/mfield.html He says: Roger Penrose explains in his book, The Emperor's New Mind that the momentum state wave function of a photon is a corkscrew or helix. He also explains that all emitted photons must carry some mass because E=mc2. Think of energy as a highly diluted form of mass or think of mass as a highly concentrated form of energy. Thus one can visualize magnetic attraction and repulsion as streams of photons with their corkscrew shaped wave functions screwing into (attraction) or screwing out of (repulsion) each other. Is there any merit to the second paragraph? How does he know that "screwing into" corresponds to attraction and "screwing out of" corresponds to repulsion? Does anyone know where I can get more info on this corkscrew model of magnetic attraction? (I e-mailed him and he never responded.) Thanks.