The Problem With Antimatter

In discussions about antimatter, the first consideration is usually why did all the antimatter from the Big Bang disappear. If that's true, why is it that antimatter pops up so often in our matter-only universe during radioactive decay? The scientific challenge is baryogenesis: what created the asymmetry between baryons and anti-baryons? Maybe there is a compensating asymmetry in the neutrino background that gives us more anti-neutrinos than neutrinos,. or maybe not, we just don't know.