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tokens: The authors thank Geza Kovacs and Lynne Hillenbrand for suggesting that we take a closer look at the Hyades and Praesepe, and for helpful comments on the manuscript. We also thank Scott Tremaine for suggestions that made the statistical discussion much clearer. This work was performed in part under contract with the Jet Propulsion Laboratory (JPL) funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. This research has made use of the SIMBAD database and the VizieR catalog access tool, operated at CDS, Strasbourg, France.