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tokens: ACKNOWLEDGEMENTS I thank Charlie Conroy and Dan Weisz for insightful comments on earlier versions of this paper, Michael Fall, Kristian Finlator, Oleg Gnedin, Pawan Kumar, Smadar Naoz, Eliot Quataert, Charli Sakari, Chris Sneden, and Eros Vanzella for helpful discussions, and Tom Petty for aural support. Support for this work was provided by The University of Texas at Austin, the National Science Foundation (grant AST-1517226), and NASA through grant NNX17AG29G and HST grants AR-12836, AR-13888, AR-13896, GO-14191, and AR-14282 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Much of the analysis in this paper relied on the python packages NumPy (Van Der Walt, Colbert Varoquaux 2011 ), SciPy (Oliphant 2007 ), Matplotlib (Hunter 2007 ), and iPython (Pérez Granger 2007 ); I am very grateful to the developers of these tools. This research has made extensive use of NASA’s Astrophysics Data System ( http://adsabs.harvard.edu/ ) and the arXiv eprint service ( http://arxiv.org ).