The Goldilocks Hypothesis

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Science  05 Dec 2003:
Vol. 302, Issue 5651, pp. 1682-1683
DOI: 10.1126/science.1092859

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Life's Solution Inevitable Humans in a Lonely Universe. Simon Conway Morris. Cambridge University Press, New York, 2003. 486 pp. $30, $18.95. ISBN 0-521-82704-3.

Conway Morris argues that the constraints on life ensure the evolution of organisms characterized by advanced sensory systems, intelligence, complex societies, tool-making, and culture-but that planets suitable for life are very rare.