I’m indebted for advice and technical assistance to David DeGraff of Alfred University, Walter Cuirle of the U.S. House of Representatives Page School, and Michael Fossel, author of Cells, Aging, and Human Disease. Thanks also to Ralph Vicinanza, for his continuing support. To Sara and Bob Schwager, for their suggestions. To my editor, Ginjer Buchanan. And to my wife, Maureen, who has to read the early version.