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In this respect I agree with Sciama, not with John.
The photons are massless - in the sense that they have zero rest mass; however, they have a non-zero relativistic mass m.
Moreover, there are situations when a single photon in free space
has A NON-ZERO REST MASS! Such a situation can be created in a quantum
optics experiement when a single photon is passed through a beam-splitter and no attempt is made to locate path chosen by the passed photon; in this case the meaningful characteristic of the photon
is its average momentum, which is, in this state, NOT equal to E/c.