Hey all, First post so I should introduce myself. I'm a freshman physics+math major at Virginia Tech, probably headed towards particle physics. I do some undergrad research w/ one of my professors, pretty lame though as I only build photomultipliers, but nontheless my foot's in the door. I'll probably be spending some time here while I'm in school. I apologize if this has been posted before, I looked a little and I don't think it has. I'm wondering whether the arrow of time can explain the anti-matter problem, or at least how they relate. It seems that the universe is made out of normal matter. Anti-matter obviously can be created for short periods of time in high energy collisions or as virtual particles one would see in a Feynman diagram. One way to think of an annihilation event in a Feynman diagram is to picture an electron going forward in time, emitting a photon, and then heading backwards in time. Entropy is increasing (second law), time seems to be going forward on large scales, so does this have anything to do with the preponderance of matter vs. antimatter? I've always been unsatisfied with the "Well, there was one extra proton at t=0, so everything annihilated and now it's all matter." Thanks.