Scientific American Magazine Vol 267 Issue 1

Scientific American Magazine

Volume 267, Issue 1

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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

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

Michael D. Ward, 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

Alfred G. Gilman, 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

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

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

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

Desmond Clark, Giancarlo Ligabue, Nicholas Toth

Quantum Philosophy

New Experiments-real and imagined - are probing ever more deeply into the surreal quantum realm

John Horgan

Departments

Letters to the Editors, July 1992

50 and 100 Years Ago: July 1992

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

COBE's Cosmic Cartographer

Piecemeal Patents

U.S. Semiconductor Toolmakers Regain Ground

One Fish, Two Fish

Metastatic Machinations

Sensible Biology

Fickle Fluids

Machine Vision

Doubling up on Payoffs for Schooling

Survival of the Fittest Bits

Book Review, July 1992

Women and the Discourse of Science