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Clearing the Air in Los Angeles

Although Los Angeles has the most polluted skies in the nation, it is one of the few cities where air quality has improved in recent decades

By James M. Lents and William J. Kelly

Large Igneous Provinces

These vast fields of lava record powerful but geologically brief pulses of magmatic activity. Their formation may have triggered significant changes in the global environment

By Millard F. Coffin and Olav Eldholm

Evolutionarily Mobile Modules in Proteins

Many proteins consist of a fairly small set of modular elements. How these units spread and multiplied during evolution is not altogether clear, but a pattern may be emerging

By Russell F. Doolittle and Peer Bork

Electrorheological Fluids

Some liquids solidify instantly when exposed to an electric field. Such protean materials may give engineers quicker, more adaptive machines

By James E. Martin and Thomas C. Halsey

Water-Pollinated Plants

Once thought to be mere aberrations of nature, these flowering aquatic species provide evidence for the evolutionary convergence toward efficient pollination strategies

By Paul Alan Cox

Simulating Brain Damage

Adults with brain damage make some bizarre errors when reading words. If a network of simulated neurons is trained to read and then is damaged, it produces strikingly similar behavior...

By Geoffrey E. Hinton, David C. Plaut and Tim Shallice

Raising the Vasa

This Swedish man-of-war foundered on her maiden voyage and slept for three centuries at the bottom of Stockholm Harbor. Here is the story of her resurrection

By Lars-ke Kvarning

The Death of Proof

Computers are transforming the way mathematicians discover, prove and communicate ideas, but is there a place for absolute certainty in this brave new world?

By John Horgan


  • Letters

    Letters to the Editors, October 1993

  • The Science Agenda

    Magnetic Apprehensions

  • Recommended

    Book Reviews--The Demographic Transition

  • 50, 100 & 150 Years Ago

    50 and 100 Years Ago: Isolating Proteins and Seeing in the Dark

  • Profile

    Revealing the Hidden Sequence

  • Amateur Scientist

    Making Fluids into Solids with Magnets

  • Science and the Citizen

    Hard Times

  • Sentries and Saboteurs

  • Creative Evolution

  • Never Give a Sucker an Even Break

  • Sharks do get Cancer

  • Run Silent, Run (Not So) Cheap

  • Jurassic Virus?

  • Departments

    A Digital Fix for the Third World?

  • Tadpoles from Heaven

  • Technology and Business

    CRADA Mania

  • A Wand for the Meter Reader

  • Mag Lift

  • Chronologically Privileged

  • Power Pack

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