Why don't you get thrown backwards when you switch on your torch? Kerstin Göpfrich made her way to the Nanophotonics Centre in Cambridge to find out from Dr. Anna Lombardi. The answer to Matt's question may blow you away...
Because they dont have any rest mass they dont have any inertia.
Ah, you do, there is a 'recoil' when measuring interactions with 'invariant mass'. But if you mean what the 'original recoil' of a 'original photon' not 'interacting' was? I don't know.
I would say that bosons like light travel on a single direction and posses little momentum. Fermions can be compared to a planetary system and travel in a sort of complex spiral motion also at much higher frequency thus containing more momentum. This explains for example clocks ticking rates reduced with speed.