On the Cover
January-February 1998 Volume 86, Number 1
A wistful gleam appears on the face of an elderly woman when she is
asked how life has changed since she was a young girl. Ninety years old
and still working in her field when the photograph was made in the
1970s, she was an expert on local medicinal plants. ...
Speedy computer algorithms offer new answers to a mathematical problem as ancient as Babylon: finding the zeros, or roots, of high-degree polynomials
Many people now live beyond their natural lifespans through the intervention of medical technology and improved lifestyles—a form of "manufactured time"
Surface subsidence can develop within a matter of days when highly soluble rocks dissolve because of either natural or human causes
Protein engineering identifies the structural basis of a 3.5 billion-year-old adaptation
When these birds are young, they delay reproduction and help others raise their offspring. The hormone prolactin may influence that cooperation
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A review of Impact! The Threat of Comets and Asteroids, by Gerrit L. Verschuur, Asteroid: Earth Destroyer or New Frontier?, by Patricia Barnes-Svarney and Mining The Sky: Untold Riches from the Asteroids, Comets, and Planets, by John S. Lewis.
See all book reviews for this issue.