The whole anitmatter thing is interesting too. When antimatter and matter come together the next energy dissipation is zero. But it does emit radiation in the process. Since the particle and anitparticle are gone, the enegry has to go somewhere. In the proton case it is emmited as a photon. Since mass stores enormous amounts of energy, if you could contain (but how...) antimatter to that level, it would emitt a lot of radiation. CERN has been making tons of anti-protons for 3 years now. You cannot make antimatter without making the corresponding matter. There is thought to be areas of the universe where anitmatter is "pooled" of sorts. Areas where there is no matter, but this is speculation.. Most of the antimatter made in the beginning of the universe was destroyed, probably broke down to smaller particles due to the emmense heat and pressure within the first second of the "big band". This created an asymmetry towards matter, which was more robust (obviously). After the first few seconds of the big bang, things cooled off enough that antimatter-matter pairs were no longer being created that often. The leftover matter is what you are today.