  We discuss the ordinary, non-supersymmetric SO(10) as a theory of fermion
masses and mixings. We construct two minimal versions of the Yukawa sector
based on $\bar{126}_H $ and either $10_H$ or $120_H$. The latter case is of
particular interest since it connects the absolute neutrino mass scale with the
size of the atmospheric mixing angle $\theta_A$. It also relates the smallness
of $V_{cb}$ with the largeness of $\theta_A$. These results are based on the
analytic study of the second and third generations. Furthermore, we discuss the
structure of the light Higgs and the role of the Peccei-Quinn symmetry for dark
matter and the predictivity of the theory.
