[abecedarius]

It's a marvelous book, but a little frustrating as well for not quite explaining enough to calculate with, even super-inefficiently. Can't we get a correct formula for the propagator, including the four spin components? When I tried to fill that in from other sources I was snowed under by all the formalism or prerequisites -- yes, it's probably a short step if you already understand it or you're smarter than me.

If someone made a clear-but-impractical QED simulator using, say, lattice gauge theory, I pledge to sing its praises. (You'd expect this to be possible for general relativity too.)