On the Cover
July-August 2001 Volume 89, Number 4
Titanium silicon carbide is a member of a recently discovered class of
ceramics with remarkable properties. The compounds discussed by Michel
W. Barsoum and Tamer El-Raghy in "The MAX Phases: Unique New Carbide and
Nitride Materials" may one day help increase the efficiency of jet
engines and industrial chemical processes, among other applications. ...
Ternary ceramics turn out to be surprisingly soft and machinable, yet also heat-tolerant, strong and lightweight
The colored part of the eye contains delicate patterns that vary randomly from person to person, offering a powerful means of identification
"Stellar embryology" takes a step forward with the first detailed look at the youngest Sun-like stars
Human emotions have deep evolutionary roots, a fact that may explain their complexity and provide tools for clinical practice
A review of 43 habitat conservation plans reveals numerous ways to reduce uncertainty for landowners and imperiled species alike
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A review of Where Mathematics Comes From: How the Embodied Mind Brings Mathematics into Being, by George Lakoff and Rafael E. Núñez.
See all book reviews for this issue.