I had a great time visiting the astrophysics group at JPL today. There is so much going on, and so much sophisticated working with and thinking about challenging data sets and challenging data analysis programs. I spoke with people working on Planck, HST, Spitzer, weak lensing, exoplanets, the Galactic Center, and numerical relativity. It was a way too-short visit. On the plane to LA I read parts of the dissertation of Ke Xiao (NYU), on brownian motion in the presence of non-trivial potential and force landscapes.