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
Features
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
René Jules Dubos
This quintessential environmentalist's quest for mechanisms of disease evolved into a philosopher's search for health
The Silicon Retina
A chip based on the neural architecture of the eye proves a new, more powerful way of doing computations
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
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
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
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.
Departments
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
- Letters
Letters to the Editors, May 1991
- Recommended
Books May 1991
- Mathematical Recreation
Mathematical Recreations May 1991
- Departments
The Analytical Economist: Bursting Bubbles
Essay - May 1991