In the morning, Mariano Gabitto (Columbia) spoke about identifying different cell types in the brain using gene expression. He is using probabilistic methods in a problem with integer parameters and no fixed complexity. That's challenging! The goal is to understand the “circuits” in the brain; that's a long-term goal, I suspect.
In the afternoon, I gave the seminar at AMNH here in NYC. I talked about using The Cannon to get detailed chemical abundances for stars. It is a great group and it was a lively conversation.