Imprints of Evolution on the Internal Kinematics of Globular Clusters
  Globular clusters are collisional systems, meaning that the stars inside them
interact on timescales much shorter than the age of the Universe. These
frequent interactions transfer energy between stars and set up observable
trends that tell the story of a cluster's evolution. This contribution focuses
on what we can learn by studying velocity anisotropy and energy equipartition
in globular clusters with Hubble Space Telescope proper motions.
