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Features

Cosmic Antimatter

Antiparticles are rare and maddeningly elusive. But they may hold clues to some of the mysteries of astrophysics

By Gregory Tarlé and Simon P. Swordy

Post-Polio Syndrome

Decades after recovering much of their muscular strength, survivors of paralytic polio are reporting unexpected fatigue, pain and weakness. The cause appears to be degeneration of motor neurons

By Lauro S. Halstead

The Earliest Views

Re-creating the experiments of pioneering microscopists reveals what they actually saw with their simple, single-lens instruments

By Brian J. Ford

Laser Scissors and Tweezers

Researchers are using lasers to grasp single cells and tinier components in vises of light while delicately altering the held structures. These lasers offer new ways to investigate and manipulate cells

By Michael W. Berns

Wireless Technologies

New Satellites for Personal Communications

Fleets of satellites will soon make it possible to reach someone anywhere on the earth, using nothing more than a small handset

By John V. Evans

Telecommunications for the 21st Century

Systems based on satellites and high-altitude platforms will merge with optical-fiber and terrestrial wireless networks to provide global, high data-rate, mobile communications

By Joseph N. Pelton

Terrestrial Wireless Networks

Seamless switching between networks will draw users to wireless data services. A working model is now in operation

By Alex Hills

Moving Beyond Wireless Voice Systems

Cell phones are but one application of wireless communications. The technology also enables accurate position determination and the monitoring of remote sites

By Warren L. Stutzman and Carl B. Dietrich Jr.

Spread-Spectrum Radio

Dicing information into digital bundles and transmitting them at low power over different frequencies can enable millions of people to send and receive simultaneously

By David R. Hughes and Dewayne Hendricks

Departments

  • On Shaky Ground

  • How Females Choose Their Mates

  • From the Editor

    How Scientific American Works

  • Letters

    Letters To The Editors, April 1998

  • Not What The Doctor Ordered

  • Anti Gravity

    Comic Relief

  • 50, 100 & 150 Years Ago

    50, 100 and 150 Years Ago: Technology Transfer, Sub Success and Egypt's Ancient Arts

  • Wonders

    The Timekeeping ELF

  • In Brief

    In Brief, April 1998

  • Profile

    An Ethnologist in Cyberspace

  • Mathematical Recreation

    Repealing the Law of Averages

  • Amateur Scientist

    Making Experiments out of Thin Air

  • Science and the Citizen

    Endangered

  • Clock Setting

  • By the Numbers

    Forest Density in the U.S.

  • Working Knowledge

    Working Knowledge—Self Operating Napkin

  • Connections

    Sheer Poetry

  • Cyber View

    The Unabomber and the Bland Decade

  • Technology and Business

    Taking On The Energizer Bunny

  • Fertilizing The Sea

  • A New Fat Pipe

  • In Focus

    Lives In The Balance

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April 1998

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