A long time ago, when I was just coming out of my Physics class examination at college, I had kind of an "inspiration" ; after long calculations, I came out with a sentence which sumarized quite well my thought:
"If photons had a mass, time travelling would be possible".
I don't remember how I arrived to this final sentence; I just remember it was related to how mass is related to energy and speed in Relativity Theory.
But I am not able to rebuild the path which led me to the sentence. I remember I noticed it down on a piece of paper I had in muy pocket... but it got lost years ago.
Now it came back to my mind upon reading a thread in this forum.
Can anybody help me to "track back" my "intuition"?