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Features

Origins of Western Environmentalism

Strategies to preserve nature arose as newly colonialized tropical lands were exploited in the 17th and 18th centuries.Scientists played an important role in this burgeoning concern

By Richard H. Grove

Building Molecular Crystals

By investigating how molecules assemble to form crystals, researchers hope to synthesize materials with novel electronic, magnetic or optical properties

By Michael D. Ward and Paul J. Fagan

G Proteins

Tucked into the internal surface of the cell's outer membrane, these versatile molecules coordinate cellular responses to a multitude of signals that impinge from without

By Alfred G. Gilman and Maurine E. Under

Genetic Algorithms

Computer programs that "evolve" in ways that resemble natural selection can solve complex problems even their creators do not fully understand

By John H. Holland

Breath Tests in Medicine

Since antiquity, it has been known that the breath contains clues to many diseases. Researchers are developing a new generation of breath tests as an alternative to invasive diagnostic procedures

By Michael Phillips

Reproductive Strategies of Frogs

The familiar progression from egg to tadpole is only one of many methods. Others include egg to froglet, egg brooding, and tadpoles in the mother's stomach

By William E. Duellman

The Last Stone Ax Makers

A chance encounter with a people living in New Guinea's highlands has given archaeologists a priceless opportunity to model prehistoric technology

By Desmond Clark, Giancarlo Ligabue and Nicholas Toth

Departments

  • Quantum Philosophy

  • Letters

    Letters to the Editors, July 1992

  • Recommended

    Book Review, July 1992

  • 50, 100 & 150 Years Ago

    50 and 100 Years Ago: July 1992

  • Profile

    COBE's Cosmic Cartographer

  • Amateur Scientist

    Survival of the Fittest Bits

  • Science and the Citizen

    The Golden Age of Cosmology

  • Compulsive Canines

  • Galling the Bears

  • Mother's Little Favorite

  • DNA Fingerprinting Reconsidered (Again)

  • Colliding Physicists

  • Sound System

  • Defining Dyslexia

  • Rapid Recall

  • Departments

    Doubling up on Payoffs for Schooling

  • Women and the Discourse of Science

  • Technology and Business

    Piecemeal Patents

  • U.S. Semiconductor Toolmakers Regain Ground

  • One Fish, Two Fish

  • Metastatic Machinations

  • Sensible Biology

  • Fickle Fluids

  • Machine Vision

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July 1992

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