AND! I forgot to mention the LQCD calculations of the muon's anomalous magnetic moment, g-2, which is a precision observable currently being studied by an expe

AND! I forgot to mention the LQCD calculations of the muon's anomalous magnetic moment, g-2, which is a precision observable currently being studied by an experiment at Fermilab. This quantity (g-2) is dominated by electrodynamic effects. The QCD contribution is on the scale of 1e-10 compared to the full result. But it is the leading theoretical uncertainty. There are two ways to get a prediction for the QCD contribution to this process. One is to try to back it out of a variety of data from unrelated experiments. In other words: try to fit it by requiring consistency. The other is a LQCD calculation. The experimental data-driven fit to the QCD contribution and the LQCD calculation differ significantly. This difference is the difference between the current experiment claiming a sizeable new physics effect (the data-driven approach) and perfect agreement with the Standard Model (LQCD calculation). So there's an interesting puzzle!