I got up at 04:55 NYC time so that I could be at MPIA Galaxy Coffee (at 11:00 European time) to talk about the project I have with Adrian Price-Whelan (Flatiron) code-named Chemical Tangents. The MPIA crew has done a great job of moderating Galaxy Coffee and making it interactive; I was interrupted many times during my talk with questions and comments (which I love). I sure miss being at MPIA! This is my first summer in 15 not living in Heidelberg. Among the many great questions I got during my talk was one from Joe Hennawi (UCSB): He asked whether the Chemical Tangents idea—that stellar element abundance ratios can depend on actions but not angles—could be turned around and used to calibrate or adjust noisy or systematically biased abundance-ratio measurements. That's a great question, because that is precisely the project I am doing with Christina Eilers (MIT) right now. It's cool that the Tangents and calibration projects are two sides of the same coin (bad metaphor?).
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