It was tough to get back to work in New York, and I spent most of the day getting ready for teaching and committees. That's not research.
I spent an hour talking with Bovy about the reconstruction of the velocity field of stars in the disk. This project is moving slowly just because our (well justified, correct) algorithm is extremely slow. I am very excited about the inference aspects of this project, because we are going to be able to make a lot of predictions about stellar radial velocities, and we will be able to test those predictions with extant data.
On a related note, I started writing a short polemic about representing posterior probability distributions (think Bayes) by sampling, and how that helps in complex scientific tasks.