The Fornax dwarf spheroidal hosts five old globular clusters, including the relatively massive cluster often labeled Fornax 3, all presently observed at radii of order a kiloparsec, yet in a cuspy ΛCDM dark halo these clusters should have experienced strong dynamical friction and spiraled into the galaxy center within a few gigayears, creating a nuclear star cluster that is not seen (Tremaine 1976; Cole et al. 2012). N-body studies show that keeping Fornax 3 and its siblings at their current distances for a Hubble time is much easier if Fornax’s dark halo has a large, nearly constant-density core, but such a core is difficult to reconcile with the cuspy profiles generically produced in ΛCDM simulations, so the “Fornax globular cluster timing problem” is often cited as evidence for either cored halos, modified gravity, or non-standard dark matter (Read et al. 2006; Boldrini et al. 2020).