I’m indebted for advice and technical assistance to David DeGraff of Alfred University; Michael Shara of the American Museum of Natural History; and Michael Fossel, author of Cells, Aging, and Human Disease. Walter Cuirle and Travis Taylor helped out at the galactic core. Thanks also to Ralph Vicinanza, for his continuing support. To Maureen McDevitt, for her comments on an early version of the manuscript. And to my editor, Ginjer Buchanan. Star chart by Curtis Square-Briggs.