The Essay "How fast can a black hole rotate?", by C. Herdeiro and E. Radu, was selected for an "Honorable Mention" in the Gravity Research Foundation 2015 Awards for Essays on Gravitation. It is the second consecutive year an essay from our group gets this distinction. The first prize was awarded to the Nobel Laureate Gerard 't Hooft, for the essay "Local Conformal Symmetry: the Missing Symmetry Component for Space and Time". See the list of all prized essays here.