  Data indicate that $\Delta I=1/2$ transitions account for 4.5-4.7% of both CP
conserving and CP violating $K \to 2\pi$ decays, as well as CP conserving
radiative $K \to \pi\pi\gamma$ processes. Observed $K \to \pi\pi\gamma/\pi\pi$
branching ratios are shown to scale near $\alpha/\pi$ or $\alpha/2\pi$. The
$K_L$-$K_S$ mixing angle $\phi$ and the semileptonic weak-rate asymmetry
$\delta$ are reviewed, and theory is shown to be consistent with data. Also, $K
\to 2\pi$ $\Delta I=1/2$ dominance is studied in the context of the chiral
constituent quark model, displaying again excellent agreement with data.
Finally, indirect and direct kaon CP violation are successfully described in
the framework of photon-mediated loop graphs. This suggests that kaon CPV can
be understood via second-order weak transitions, radiatively corrected.
