I accomplished most of the writing of this article while on sabbatical. I thank the University of Maryland for providing sabbatical support, as well as the Carnegie Institution of Science’s Department of Terrestrial Magnetism, the Lunar and Planetary Institute, the University of Vienna, and the Tokyo Institute of Technology’s Earth-Life Science Institute for hosting me during the sabbatical. The work described below by the UMd group has been supported by numerous NSF and NASA grants over the years, most recently by NASA grants NNX13AF83G and NNA14AB07A, and NSF-CSEDI grants EAR1160728 and EAR1265169. These sources of funding are gratefully acknowledged. Mary...

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