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The Earth's Mantle below the Oceans

Samples collected from the ocean floor reveal how the mantle's convective forces shape the earth's surface, create its crust and perhaps even affect its rotation

By Enrico Bonatti

Targeted Gene Replacement

Researchers can now create mice bearing any chosen mutations in any known gene. The technology is revolutionizing the study of mammalian biology

By Mario R. Capecchi

High-Speed Silicon-Germanium Electronics

The author has helped create electronic devices that outperform traditional silicon technology yet remain compatible with standard manufacturing methods

By Bernard S. Meyerson

The Quantum Physics of Time Travel

Common sense may rule out such excursions --but the laws of physics do not

By David Deutsch and Michael Lockwood

The Dynamics of Social Dilemmas

Individuals in groups must often choose between acting selfishly or cooperating for the common good. Social models explain how group cooperation arises --and why that behavior can suddenly change

By Natalie S. Glance and Bernardo A. Huberman

Frogs and Toads in Deserts

Amphibians seem unlikely desert denizens. But those living in dry climes reveal a diverse and unusual array of adaptations to life at the extremes

By Lon L. McClanahan, Rodolfo Ruibal and Vaughan H. Shoemaker

Departments

  • Spinning Out

  • Can the Growing Human Population Feed Itself?

  • Wire Pirates

  • Letters

    Errata

  • Letters to the Editors, March 1994

  • TechnoFiles

    Inside Story

  • Recommended

    Book Reviews--What is Humankind?

  • 50, 100 & 150 Years Ago

    50 and 100 Years Ago: National Television Networks and Meteor in Nevada

  • Profile

    Confronting the Final Limit

  • Mathematical Recreation

    The New Merology of Beastly Numbers

  • Science and the Citizen

    Image Enhancement

  • Chaotic Chaos

  • Down the Green

  • Molecular Mischief

  • Gene Rich, Cash Poor

  • Cold Confusion

  • Fermat's Theorem Fights Back

  • Departments

    The Professor, the University and Industry

  • Technology and Business

    Making Money

  • The Last Frontier

  • King Cotton

  • Biocatalysts Turn Rings around the Competition

  • Prosthetic Vision

  • Is Bigger Still Better?

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March 1994

See the World from a Different Perspective

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