  I explain, as simply and pedagogically as I can, recent arguments that the
high-temperature baryon number violation rate depends on the electroweak
coupling as $\Gamma = # \alpha_\w^5 T^4$ (up to higher order corrections). This
is in contrast to the form $\Gamma = # \alpha_\w^4 T^4$ that has historically
been assumed in discussions of electroweak baryogenesis. I will give a general
analysis of the time scale for non-perturbative gauge field fluctuations in hot
non-Abelian plasmas.
