I wasted much of the day building IDL routines to make pretty pictures from healpix maps. This was a waste both because there are better programmers than me, and better languages than IDL.
Over lunch, Schiminovich and I discussed our project of estimating the intensity of the ionizing radiation impinging on the Milky Way from extragalactic sources, and the contribution from different kinds of sources. We discussed the issue that most of the ionizing radiation comes from significant redshift; this is both because quasars are more abundant and luminous at higher redshift, and because galaxies tend to be self-shielding. Hopefully we can refine our understanding of the radiation with GALEX.