"When two bodies are involved in an electro-magnetic interaction the two events have scalar product zero. In effect it is the same event. How can you observe the interaction where the separation in Minkowski space is zero? An electro-magnetic interaction is an irreducible process. We can theorize about it, but we cannot observe it. Light cannot be observed."
Insane raving gibberish. Light in classical limit moves on null geodesics where ds = 0. Sorry to hear that Michael Press is blind and cannot observe light.
"How about you start posting properly composed nntp messages? You know: 66 character lines, quoted material, full References: header."