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Features

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

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

Departments

  • Attention-Deficit Hyperactivity Disorder: A Psychological Model of ADHD

  • Go Ahead, Walk in the Mud

  • Forestalling Violence

  • Herb Remedy

  • Stalking the Wild Dugong

  • Tomorrow, Partly Froggy

  • River of Vitriol

  • Healing Cancer

  • Weightlessness and the Human Body

  • Thermophotovoltaics

  • Letters

    Letters to the Editors, September 1998

  • Recommended

    Mathematics for the Many

  • 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

    The Flip Side of the Universe

  • 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

  • The Dope On Holography

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September 1998

Think Outside the Gift Box