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Features

The Photorefractive Effect

A laser beam passing through a crystal can suddenly burst into a spray of light. This photorefractive effect may be the key to developing computers that exploit light instead of electricity

By David M. Pepper, Jack Feinberg and Nicolai V. Kukhtarev

What Caused the Mass Extinction?

An Extraterrestrial Impact

Accumulating evidence suggests an asteroid or comet caused the Cretaceous extinction

By Frank Asaro and Walter Alvarez

A Volcanic Eruption

What dramatic event 65 million years ago killed most species of life on the earth? The author argues it was a massive volcanic eruption

By Vincent E. Courtillot

Ocean Acoustic Tomography

Oceanographers are using principles analogous to medical X-ray tomography to obtain three-dimensional images of ocean currents and temperatures

By Peter F. Worcester and Robert C. Spindel

Boron Neutron Capture Therapy for Cancer

A twofold treatment brings together boron and neutrons to create a lethal radiation that can attack tumor cells without damaging normal tissues in the process

By Albert H. Soloway, Ralph G. Fairchild and Rolf F. Barth

Universal Truths

By John Horgan

Departments

  • 50 and 100 Years Ago: October 1990

  • New Order

  • A Latin American Caterpillar Calls Ants to a Free Meal

  • Venus Unveiled

  • Fowl Play

  • Seeing the Light

  • Adjusted Agenda

  • Stardust Memories

  • Teaching Teachers

  • Cannabis Comprehended

  • Vive La Diffèrence

  • A Grandmaster Chess Machine

  • Parental Imprinting of Genes

  • Gigabit Connection

  • On Again, Off Again

  • Cold Cathodes

  • Infrastructure Woes

  • Less of a Problem?

  • Essay: The Business of Science Education

  • Letters

    Letters to the Editors, October 1990

  • Recommended

    Books, October 1990

  • Amateur Scientist

    The Amateur Scientist, October 1990

  • Departments

    The Analytical Economist, October 1990

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October 1990

Think Outside the Gift Box