John Johnson and Ben Montet arrived from Harvard today and Tim Morton arrived from Princeton for serious hacking, and Johnson gave our physics colloquium. He spoke about how exoplanets are found and characterized, and the point that if you want to characterize the exoplanets precisely, you must also characterize the stars precisely. Amen! We recognized at the end of the day that we should be talking about The Cannon but didn't get a chance to connect on that. Tomorrow is hacking day, with his group (Exolab) and my group (CampHogg) all in one room!