I'm a little skeptical that all 10^80 particles could fit inside a universe as small as it was after the 3rd minute. I know there is a lot of empty space inside a particle so maybe in the beginning that empty space was not there, but I'm still skeptical. I'm still confused about whether or not the conversation of baryon number really holds. Is it ever the case that virtual particle get promoted to real particle hood, after the 3rd minute? Here's a passage from Paul Davies' The Last Three Minutes: And here is a quote from Steven Weinberg's The First Three Minutes concerning the conservation of Baryon number: Again, I find this hard to believe. How could all 10^80 particles fit into such a small size? But yet S.W. says it right there in black and white. Also, are hyperons some jargon from the 70's that no one uses anymore?