I spent the day at the IAS working with Lang. We started re-coding our celestial mechanics stuff in C for performance. That was painful. We spent quite a bit of the non-coding parts of the day talking to various people about two of our craziest projects: One is the Comet Holmes project (the Web is a sky survey; working with untrusted data; automated discovery), and the other is my project with Sam to revolutionize spectral data analysis (spectral extraction as data rotation; producing functions not spectra; daisy-chaining probabilistic inference). I can't say that everyone at the IAS was impressed!