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Urban Planning in Curitiba

A Brazilian city challenges conventional wisdom and relies on low technology to improve the quality of urban life

By Jonas Rabinovitch and Josef Leitman

Collisions with Comets and Asteroids

The chances of a celestial body colliding with the earth are small, but the consequences would be catastrophic

By Tom Gehrels

The African AIDS Epidemic

In parts of sub-Saharan Africa, nearly 25 percent of the population is HIV-positive as a result of heterosexual transmission of the virus. Could lack of circumcision make men in this region particularly susceptible?...

By John C. Caldwell and Pat Caldwell

Budding Vesicles in Living Cells

A transatlantic collaboration has uncovered the machinery responsible for forming the tiny but essential containers, or vesicles, that store proteins and shuttle them to and fro in cells...

By James E. Rothman and Lelio Orci

The Art and Science of Photoreconnaissance

In the 1950s and 1960s, photointerpreters devised ways of extracting valuable information from recondite images. Oftentimes, their work profoundly affected international relations...

By Dino A. Brugioni

Electrons in Flatland

Trapped in a two-dimensional plane, electrons can exhibit the quantum Hall effect, a startling phenomenon now thought to be intimately connected to superconductivity

By Dung-Hai Lee, Shou-Cheng Zhang and Steven Kivelson

Caribbean Mangrove Swamps

Despite their ubiquity and prominent position between land and sea, these tropical ecosystems still hold countless surprises for researchers

By Klaus Rtzler and Ilka C. Feller

Vital Data

The Human Genome Project is producing a plethora of information that will illuminate our hidden susceptibilities to disease. The effort could transform medical science. But new dangers are arriving, too...

By Tim Beardsley


  • From the Editor

    Letter from the Editor, March 1996

  • Letters

    Letters to the Editors, March 1996

  • Recommended

    Reviews and Commentaries--Next Generation Education

  • Anti Gravity

    It's all happening at the Zoo(logy Meeting)

  • 50, 100 & 150 Years Ago

    50, 100 and 150 Years Ago: Uncomfortable Airplanes, Typewriter and The 'Wild Man'

  • Wonders

    Symmetry and Symmetry-Breaking in South Africa

  • Profile

    Seeing the World in a Snowflake

  • Mathematical Recreation

    Playing with Quads and Quazars

  • Amateur Scientist

    Exploring Chemical Bonds

  • Science and the Citizen

    Regulating the Body Business

  • Escher for the Ear

  • Out of this World

  • Viral Tracers

  • Rain Forest Crunch

  • Getting the Goats

  • Rescuing an Endangered Tree

  • No Light Matter

  • Pass the Salt, Please

  • By the Numbers

    Stroke Mortality in Men Ages 35 to 74

  • Connections

    Satisfied Customers

  • Departments

    Having It All

  • Privacy and Data Collection on the Net

  • Field Notes

    Plane Scary

  • Technology and Business

    Hot Pork

  • Tough Stuff

  • Smart Shopping

  • Bad Timing

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