[Physicist]

Under any formulation of quantum gravity, the graviton, like the photon, will be self-conjugate, that is, it will be its own antiparticle.

[XBob]

140 - how about putting that in non-physicist terms, like snudge just did.

[Psalm 73]

Just read through this whole thread before commenting, (I don't like to just burst in).
When you touched on the topic of "light" (it's a particle, it's a wave, it's, it's...)
I remembered a great quote by Goethe (who is so much more than just the author of Faust) on the topic of optics/light: "There is no such thing as optical illusion - it is all optical reality".
I think he had a great grasp of the philosophy of what "is" is.