publications. His book on the Apollo lunar astronauts and their experiences will be published by Viking/Penguin in Spring 1994. A former editor of Sky & Telescope magazine, he is the co-editor of "The New Solar System," a compendium of planetary science issues now in its 3rd edition. He also authored a children's book, "Where Dinosaurs Walked," for World Book/Childcraft. Before entering the field of science writing in 1980, he served as a research geologist at the Smithsonian Institution's Center for Earth and Planetary Studies in Washington, D.C. He holds a bachelor's degree in geology from Brown University.

Addison Greenwood

Addison Greenwood is the author of six books, most recently "Science at the Frontier" (1992), published by National Academy Press. His magazine credits range from BrainWork to Rolling Stone. He writes about science for radio and television, and also lectures about the brain and mind. Greenwood lives in Washington, D.C., and is currently at work on a novel.

T.A. Heppenheimer

T.A. Heppenheimer holds a Ph.D in aerospace engineering, and has held research fellowships at the California Institute of Technology and the Max Planck Institute in Heidelberg, Germany. He is an associate fellow of the American Institute of Aeronautics and Astronautics. Three of his hardcover books—"Colonies in Space" (1977), "Toward Distant Suns" (1979), and "The Man-Made Sun" (1984)—have been selections of the Book-of-the-Month Club and its affiliates. As a free-lance writer, he has contributed to most of the nation's popular magazines that deal with science and technology and is a frequent contributor to American Heritage. He also has written extensively on Air Force and naval technology. He lives in Fountain Valley, California.

Michelle Hoffman

Michelle Hoffman writes and edits articles about the life sciences with a particular emphasis on molecular and cell biology, biotechnology, immunology and genetics. She started her publishing career as a staff editor and the cover editor at Cell, and moved on to write for Focus , a weekly newsletter produced at Harvard Medical School. Later, she joined the news staff of Science as the magazine's northeast correspondent. In addition to her magazine work, she edited the molecular biology textbook Genes IV. She is now an associate editor for American Scientist and lives in North Carolina.

David Holzman

David Holzman is currently Washington editor of BioWorld, a daily fax newsletter on biotechnology. As a staff writer on science and medicine for Insight magazine, a position he held for five years, Holzman won first prize in feature writing in 1989 from the American College of Radiology for his cover story, "Imaging Unveils Medical Mysteries." Holzman has also freelanced articles for Science, Forbes, Mosaic, Business and Health, and numerous newspapers, including the Washington Post, the Los Angeles Times, and the Cleveland Plain Dealer . A cycling enthusiast, Holzman bicycled across America following his graduation from the University of California, Berkeley, in 1975. He resides in Washington, D.C.

Elizabeth J. Maggio

Elizabeth Maggio is a Los Angeles-based freelance writer. Her career in science journalism

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