quite important for the interpretation of numerical work on light hadron spectroscopy, is how this spectroscopy depends on $m_s$. Specifically, how does the ratio-sequence $f_\pi:m_\rho:m_N:m_\Delta$ vary as $m_s$ is taken from infinity down to zero? The (un?)reasonable success of the valence-quark/bag model, and of the quenched approximation, seem to suggest very mild dependence, but the instanton liquid model seems to suggest more dramatic effects.

There are several major issues in QCD, especially regarding its phase structure, that hang on the value of $m_s$. I’ll mention them in due course.

### Weak Matrix Elements that\
Add Value to Experiments

The precise determination of $\epsilon^\prime/\epsilon$ in $K$ meson decays, and the cornucopia of results on $B$ meson decays and CP violation emerging from the BABAR and BELLE collaborations, are beautiful and outstanding achievements in experimental physics. But to extract this work’s full potential we’ll need to produce theoretical calculations of hadronic matrix elements with comparable accuracy. Only after controlling this “QCD background” can we make inferences regarding the precise values of weak mixing angles and phases, and the possible influence of physics beyond the standard model.

Here there is a picture that is worth a thousand words. Figures \[F2\]a and \[F2\]b both 