Scientific American Magazine Vol 264 Issue 5

Scientific American Magazine

Volume 264, Issue 5

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Features

Progress in Oral Rehydration Therapy

Each year, the therapy—feeding of a simple electrolyte solution—saves the lives of a million children who become dehydrated from diarrhea. New versions are being developed to improve that number

William B. Greenough, Norbert Hirschhorn

Anyons

In quantum mechanics, indistinguishable particles are subject to special interactions. Recent work has revealed the existence of a rich new class of possibilities: anyons

Frank Wilczek

René Jules Dubos

This quintessential environmentalist's quest for mechanisms of disease evolved into a philosopher's search for health

Carol L. Moberg, Zanvil A. Cohn

The Silicon Retina

A chip based on the neural architecture of the eye proves a new, more powerful way of doing computations

Carver Mead, Misha A. Mahowald

The Genesis of Ores

A precise series of geologic events takes place before metals become minable. Water, magma and other fluids as well as weather and wind play essential roles in the formation of ores

George Brimhall

The Genetics of Thoroughbred Horses

Thoroughbreds are the most prized of domestic animals yet the least touched by modern genetics. New studies explore how inheritance affects their fertility and track performance

Patrick Cunningham

Mechanical Engineering in the Medieval Near East

Muslim engineers preserved earlier technology and added inventions as basic as the crank, the windmill and the suction pump. Some of their innovations anticipated much later developments in Europe

Donald R. Hill

Cleaning Up Coal

Pushed by Congress, electric utilities are on the verge of taking bold steps to cut emissions caused by burning America's most abundant fuel.

Elizabeth Corcoran

Departments

Letters to the Editors, May 1991

50 and 100 Years Ago: May 1991

Up in Flames

U.S. Gags Discussion of War's Environmental Effects

Proofreading Genes

Hol Chan

Freezing Point

Parched Policy

Reluctant Revolutionary

Handful of Pain

Light Flight

Cadmium Charges

Protein Probe

Open Channels

The Analytical Economist: Bursting Bubbles

Mathematical Recreations May 1991

Books May 1991

Essay - May 1991