[calex59]

That is just horseshit. Show me real matter converted from pure energy.

[HangnJudge]

It is real enough if you work with radiation detection equipment. Any field with a photon flux including photons >1.02 MeV will have secondary photons of 0.511 mev from positron/electron annihilation events

I guess it just depends on your definition of "real". (masters science -Applied Nuclear Science -1978 - Ga. Tech)