I spent the day debugging with various students. Eddie Schlafly (MPIA) and I helped Nina Hernitschek (MPIA) debug her Gaussian-process (plotting) code, I helped Kopytova debug her spectral fitting code, and Rix and I helped Anna Ho debug her LAMOST models. On the latter, I have a hypothesis that perhaps bad data (strange, corrupted, or physically odd stars) are distorting the data-driven model of The Cannon. In particular, if there are outliers, we will get bad results for the intrinsic scatter parameters in the model. This all came up because the goodness-of-fit measurements are coming in “too good”.