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Attention-Deficit Hyperactivity Disorder: A Psychological Model of ADHD

By Russell A. Barkley

Preserving the Laetoli Footprints

The discovery of hominid footprints in East Africa reshaped the study of human origins. Now conservators have protected the fragile tracks from destruction

By Martha Demas and Neville Agnew

Weightlessness and the Human Body

The effects of space travel on the body resemble some of the conditions of aging. Studying astronauts' health may improve medical care both in orbit and on the ground

By Ronald J. White

Making New Elements

Three new elements -- 110, 111 and 112 -- have been produced over the past several years. Scientists are now struggling to create 113 and 114. How many elements can they add to the periodic table?...

By Fritz Peter Hessberger and Peter Armbruster

The Evolution of the Periodic System

From its origins some 200 years ago, the periodic table has become a vital tool for modern chemists

By Eric R. Scerri

The Oort Cloud

On the outskirts of the solar system swarms a vast cloud of comets, influenced almost as much by other stars as by our sun. The dynamics of this cloud may help explain such matters as mass extinctions on Earth...

By Paul R. Weissman


Semiconductors that convert radiant heat to electricity may prove suitable for lighting remote villages or powering automobiles

By Mark C. Fitzgerald and Timothy J. Coutts


  • From the Editor

    Go Ahead, Walk in the Mud

  • Letters

    Letters to the Editors, September 1998

  • Recommended

    Mathematics for the Many

  • Anti Gravity

    Tomorrow, Partly Froggy

  • 50, 100 & 150 Years Ago

    50, 100 and 150 Years Ago: The Transistor Appears, On Evolution and Gold!

  • Wonders

    A Minor Shift in Point of View

  • In Brief

    In Brief, September 1998

  • Profile

    Riding the Back of Electrons

  • Mathematical Recreation

    Counting the Pyramid Builders

  • Amateur Scientist

    Spooling the Stuff of Life

  • Science and the Citizen

    Herb Remedy

  • Stalking the Wild Dugong

  • The Flip Side of the Universe

  • River of Vitriol

  • A World Aflame

  • By the Numbers

    Ethnic Groups in the World

  • Working Knowledge

    Working Knowledge--Compact Disk Players

  • Connections

    Rebellious Affairs

  • Cyber View

    Opaque Transparency

  • Technology and Business

    The Reinvention of Paper

  • Healing Cancer

  • The Dope On Holography

  • In Focus

    Forestalling Violence

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