Trained as a chemist, L. H. SPERLING is Professor Emeritus of both Chemical Engineering and Materials Science and Engineering at Lehigh University in Bethlehem, Pennsylvania. He remains active in consulting, speaking, and writing.GEORGE ODIAN received his PhD from Columbia University. He is currently Emeritus Professor of Chemistry at the College of Staten Island of the City University of New York. He has previously served as professor of chemistry and chairman, Division of Pure and Applied Sciences at Richmond College of CUNY, assistant professor at Columbia University, research director of RAI Research Company, and research chemist at Thiokol Chemical Company. He has written over sixty research publications and authored both taped and short courses for the American Chemical Society. He is also the coauthor of four books in general, organic, and biochemistry.