HST proper motions in Galactic globular clusters
  Proper motions (PMs) are crucial to fully understand the internal dynamics of
globular clusters (GCs). To that end, the Hubble Space Telescope (HST) Proper
Motion (HSTPROMO) collaboration has constructed large, high-quality PM
catalogues for 22 Galactic GCs. We highlight some of our exciting recent
results: the first directly-measured radial anisotropy profiles for a large
sample of GCs; the first dynamical distance and mass-to-light (M/L) ratio
estimates for a large sample of GCs; and the first dynamically-determined
masses for hundreds of blue-straggler stars (BSSs) across a large GC sample.
