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. ...
FEATURE ARTICLES
Victor Pan
Speedy computer algorithms offer new answers to a mathematical problem as ancient as Babylon: finding the zeros, or roots, of high-degree polynomials
S. Jay Olshansky, Bruce Carnes, Douglas Grahn
Many people now live beyond their natural lifespans through the intervention of medical technology and improved lifestyles—a form of "manufactured time"
Joseph Martinez, Kenneth Johnson, James Neal
Surface subsidence can develop within a matter of days when highly soluble rocks dissolve because of either natural or human causes
Antony Dean
Protein engineering identifies the structural basis of a 3.5 billion-year-old adaptation
Stephan Schoech
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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