  We propose that ultrahigh energy cosmic rays are produced in binary neutron
star mergers. Interpreting the highest energy events as r-process nuclei
eliminates the need for exotic sources, while the observed near-universal
maximum rigidity of ultrahigh energy sources can be understood as due to the
uniformity of jets generated by the gravitationally-driven dynamo, given the
narrow range of total binary neutron star masses. We discuss evidence for this
scenario, and its prediction of coincidences between neutrinos above 10 PeV and
gravitational waves.
