I gave my dark-matter talk at Drexel today, and had great conversations with various Drexelians. Also a nice dinner with Gordon Richards (Drexel) and Willman and Fadely (the latter two took the train from Haverford for the occasion). Willman pointed out over dinner that our hierarchical model that will do star–galaxy separation for LSST at faint levels, using a hierarchical bayesian approach on all information available, will actually answer all possible astrophysics questions of any kind, ever. That's the kind of project I like to be working on. What she says is true because the project involves building a rich and justified model of the data.