Okay, second question I have to ask, again, hopefully not stupid. First, I've been perusing the forums and see the common question asked again and again, what's it like for a photon "experiencing" reality, and I totally agree or understand the standard answers: the math breaks down, we don't/can't know, the frame is invalid, but an electron moving at .99c would see such and such. The proper time for a photon is null and it travels through no space to arrive at its destination. So it has this null, or completely unextended, aspect. But within spacetime it's an energy/momentum transmitter, and acts as a carrier wave for information. Maybe this is a meaningless question, or perhaps my characterization is inaccurate, but does anybody have a good explanation for how this dual aspect works? Again, thanks for any help. C.