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Environmental Change and Violent Conflict

Growing scarcities of renewable resources can contribute to social instability and civil strife

By Thomas F. Homer-Dixon, Jeffrey H. Boutwell and George W. Rathjens

Resistance in High-Temperature Superconductors

Researchers are beginning to see how the motion of magnetic vortices in these materials can interfere with the flow of current

By David J. Bishop, Peter L. Gammel and David A. Huse

Zinc Fingers

They play a key part in regulating the activity of genes in many species, from yeast to humans Fewer than 10 years ago no one knew they existed

By Daniela Rhodes and Aaron Klug

How Should Chemists Think?

Chemists can create natural molecules by unnatural means. Or they can make beautiful structures never seen before. Which should be their grail?

By Roald Hoffmann

A Technology of Kinetic Art

Delicate interplay of weights and balances choreographs the author's sculptures so that the gentlest gusts of air set their parts in motion

By George Rickey

Breaching the Blood-Brain Barrier

Development of a therapy for meningitis has revealed how bacteria penetrate the blood-brain barrier. This knowledge may help physicians treat other disorders of the brain

By Elaine Tuomanen

Redeeming Charles Babbage's Mechanical Computer

A successful effort to build a working, three-ton Babbage calculating engine suggests that history has misjudged the pioneer of automatic computing

By Doron D. Swade

Selling to Survive

By Tim Beardsley


  • Letters

    Letters to the Editors, February 1993

  • Recommended

    The Preservation of the Planet

  • 50, 100 & 150 Years Ago

    50 and 100 Years Ago: Skeletal Evidence for Walking in Circles When Lost

  • Profile

    The Physicist as a Young Businessman

  • Mathematical Recreation

    A Partly True Story

  • Science and the Citizen

    Livable Planets

  • What if They Don't Have Radios?

  • COBE Corroborated

  • Genes and Crime

  • Faux Fullerenes

  • The Artist, the Physicist and the Waterfall

  • Electronic Envelopes?

  • Making Waves

  • Departments

    Soul of a New Economic Idea?

  • Germany and the Bomb: New Evidence

  • Technology and Business

    Zip Code Breakers

  • Surreal Science

  • Lightning Lure

  • Learning Companies

  • Shell Shocked

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