Dark particles and where to find them

Many open questions in particle physics motivate the existence of "dark" particles which do not interact directly with the electromagnetic, weak, or strong forces. These particles may be intimately connected to the observed relic abundance of dark matter, and to the origin of neutrino mass. In this talk I will explain how existing experiments (such as neutrino "telescopes", muon facilities, and dedicated beam dump searches) can be used to search for very weakly interacting particles with masses on the order of, or less than, the proton mass.