I also think that photons must have mass, maybe very very little, but they must have some .... maybe we can say that the less mass they have ( can we
give it a name : a PLANCK-mass for the photon ??? ) the more electromagnetic force they have ????

when a particle has very strong electromagnetic
force ( photons, other particles X-ray etc .. ) the less mass they have, the more mass the less E.M. force ???? a rockstone : much mass, less E.M.
force ..... I do NOT know, I just dream about all those things and then notice it during my sleep .... and think about it afterwards ....
peace and love ..... maybe love is a E.M. force !!! once I did smoke some grass with my girlfriend, in the 1968 period, and we did look in each ones
eyes : you never will believe me but we had at that moment a very very strong flash, lightning between our eyes ... and it did feel also physically
!!! we were so scared about this that she did feel sick after that, like some bad trip, and I was very worried about her ... in the end all came OK,
but there was a force, a real one, between our eyes/2 bodies ..... so what ?? i do not KNOW !!!!
love is the strongest force in the universe - that I know for sure.