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Features

The Brain's Immune System

It consists of cells called microglia that are normally protective but can be surprisingly destructive. The cells may contribute to neurodegenerative diseases and to the dementia of AIDS

By Wolfgang J. Streit and Carol A. Kincaid-Colton

Chaotic Climate

Global temperatures have been known to change substantially in only a decade or two. Could another jump be in the offing?

By Wallace S. Broecker

Holographic Memories

After more than 30 years, researchers are on the verge of using holograms to store data in memories that are both fast and vast

By Demetri Psaltis and Fai Mok

Charles Darwin: The Last Portrait

This newly rediscovered photograph appears to be the last ever made of the great evolutionist

By Richard Milner

God's Utility Function

Humans have always wondered about the meaning of life. According to the author, life has no higher purpose than to perpetuate the survival ofDNA

By Richard Dawkins

The Discovery of X-rays

One hundred years ago this month, Wilhelm Conrad Röntgen cast the first x-ray images by chance

By Graham Farmelo

The Science of Juggling

Studying the ability to toss and catch balls and rings provides insight into human coordination, robotics and mathematics

By Peter J. Beek and Arthur Lewbel

Departments

  • Some Women are More Equal than Others

  • The World's Imperiled Fish

  • Reviews—Truth Abducted

  • From the Editor

    Letter from the Editor

  • Letters

    Letters to the Editors, November 1995

  • 50, 100 & 150 Years Ago

    50, 100 and 150 Years Ago: Oxygen Tents for Premature Babies, Importance of Earthworms and News of the Potato Famine

  • Wonders

    On Neutrino Astronomy

  • Profile

    Coming through Madness

  • Mathematical Recreation

    Ways to Tile Space with Knots

  • Amateur Scientist

    Measuring the Wind with Hot Metal

  • Science and the Citizen

    Get Smart, Take a Test

  • Fiber that may not be good for you

  • The Big Thaw

  • Transforming Hyde into Jekyll

  • The Noses Have It

  • A Never-Ending Feast

  • Out of Place

  • Gay Genes, Revisited

  • Solar Secrets

  • Country Music

  • By the Numbers

    Male Deaths Caused by Heart Disease, by County

  • Connections

    The Silk Road

  • Departments

    Doing Business on the Net

  • Field Notes

    Attracted to the Pole

  • Technology and Business

    Luddites on the Hill

  • Clearing the Air

  • Mind Meets Machine, Sort of

  • Meta-Virus

  • Rights of Privacy

  • Sewage Treatment Plants

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November 1995

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