Trillion-frame-per-second video
"you can see photons moving through space..." I think of this statement and cant help but think it is fundamentally flawed. One cant see the photon moving through space. You might be able to see an electron moving through space because e can emit a photon. But photons cannot emit photons while moving. In essence one only sees the photon when it hits the detector. Physics majors feel free to correct if i am mistaken.