PHILLIP F. SCHEWE works at the Joint Quantum Institute at the University of Maryland, where he is director of communication. He has a PhD in physics but has spent most of his career as a writer, chiefly as an explainer and popularizer of science. In addition, he has written numerous plays, which have been performed in New York, Washington, DC, and elsewhere. His previous book, The Grid, a history of the impact of electricity on society, was called by NPR one of the top science books of the year for 2007. He lives in Takoma Park, Maryland.