We live in a universe dominated by matter, but how did it end up that way? In the next Physics Seminar Series talk at 2 p.m. today (Wednesday, Oct. 28) in 128 Jabara Hall, professor Marj Corcoran of Rice University, will discuss what we know and don't know about the origin of the matter-antimatter asymmetry in our universe, and how we hope to learn more in the future.