（ABSTRACT）

I argue that the near-equality of baryonic and dark matter densities may be an important clue to the origin of the baryon asymmetry and the nature of the dark matter. I show that if a new kind of stable particle carrying baryon number exists, with mass less than about 12 GeV and with a modest degree of CP violation in its interaction, then the abundance of dark matter and the baryon asymmetry can naturally be explained. The baryon asymmetry in this scenario is only an asymmetry in packaging, and the number of quarks and antiquarks in the universe is equal. I present two possible candidates for the new baryon. 1) If the H dibaryon is lighter than 2.04 GeV (mH