I spent a great day at the Institute for Advanced Study in Princeton. Peebles and I worked on our critical review of observations relating to CDM on galaxy scales in a borrowed office. We were interrupted by a great talk by Alice Shapley (Princeton) on gas-phase metallicities as a function of redshift, including all the complex differences between star-formation regions at high redshift and low. We were also interrupted by the inimitable Tuesday Lunch (now Bahcall Lunch) which continues in the traditional way. I spoke about Astrometry.net, which generated a surprising amount of questions given that most of the audience is concerned with much more theoretical matters.
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