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Seed Dispersal by Ants

Thousands of plant species rely on ants to disperse their seeds. With special food lures and other adaptations, a plant can induce the insects to carry away its seeds without harming them

By Steven N. Handel and Andrew J. Beattie

Superconductors Beyond 1–2–3

Yttrium1-barium2-copper3 oxide is only one of many new high-temperature superconductors. All have planes of copper and oxygen atoms, providing the perfect highways for electrons

By Robert J. Cava

AIDS-Related Infections

Until the AIDS virus is defeated, hope for improving survival time and the quality of a patient's life will rest to a great extent on improved therapies for the opportunistic infections of AIDS

By John Mills and Henry Masur

The Language of Fractals

These unimaginably detailed structures are more than mathematical curiosities. Fractal geometry succinctly describes complex natural objects and processes

By Hartmut Jürgens, Heinz-Otto Peitgen and Dietmar Saupe

When the Melting and Freezing Points are not the Same

Atomic clusters can offer clues to freezing and melting. These aggregates of atoms or molecules—numbering from a few to a few hundred-can coexist as solids and liquids

By R. Stephen Berry

Global Warming Trends

Analysis of land and marine records confirms that our planet has warmed half a degree Celsius in the past century. Future warming trends, however, remain uncertain

By Philip D. Jones and Tom M. L. Wigley

Maya Art for the Record

As economic development accelerates damage to Maya murals, hand-painted replicas serve as vital archaeological sources

By June Kinoshita

Departments

  • 50 and 100 Years Ago: August 1990

  • Dark Days

  • Big Country, Big Problems

  • Hot Geese

  • Oravske Kuru

  • Bufo Abuse

  • A Clock in the Trees

  • Unsolved Mysteries

  • Third World Ballistic Missiles

  • A Thin Line

  • Plastic Goes Green

  • Down on the Pharm

  • Solar Sells

  • Letters

    Errata

  • Letters to the Editors, August 1990

  • Recommended

    Books, August 1990

  • Perspectives

    The Sea Turtle's Tale

  • Profile

    Gene Doctor

  • Amateur Scientist

    The Amateur Scientist, August 1990

  • Departments

    The Analytical Economist, August 1990

  • Essay: A Born Naturalist's Keen Insights

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August 1990

Think Outside the Gift Box