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If the Universe Is Teeming with Aliens .. Where Is Everybody?. Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life. Stephen Webb. Copernicus (Springer-Verlag), New York, in association with Praxis, Chichester, UK, 2002. 300 pp. $27.50. ISBN 0-387-95501-1.
Sampling the wide variety of theories about extraterrestrial life, Webb recognizes three categories of answers to Fermi's question: aliens are among us, they have not yet communicated, or they do not exist.