Skip to main content


Getting Out of the Starting Block

Verification issues should not obstruct an agreement that achieves major reductions in strategic arms. An effective verification regime should deter militarily significant acts of noncompliance...

By Sidney N. Graybeal and Patricia Bliss McFate

The Evolution of the Earth's Magnetic Field

Molten iron flows through the outer core, creating conditions that generate the earth's magnetic field. Maps of magnetic activity at the core surface link fluid flow to the evolution of the field...

By Jeremy Bloxham and David Gubbins

Synapse Formation in the Developing Brain

As the brain develops, existing synapses between nerve cells are refined and new connections are made. The changes are not automatic; they depend in part on the young neurons generating impulses...

By Ronald E. Kalil

Science in Pictures: The First Color Photographs

The earliest schemes for capturing color images were elaborate and unwieldy—but ingenious nonetheless

By Grant B. Romer and Jeannette Delamoir


Small aggregates of atoms constitute a distinct phase of matter. Their chemistry, at once highly reactive and selective, has possible applications in catalysis, optics and electronics

By Michael A. Duncan and Dennis H. Rouvray

The Birds of Paradise

Diet has a major influence on the social and sexual behavior of these tropical birds. It explains why some species are monogamous and why others are highly promiscuous

By Bruce M. Beehler


In the absence of fully autonomous robots, machines operated by a person at a distance can carry out tasks in remote or hostile environments

By William R. Uttal

The Mithraic Mysteries

The icons of this ancient Mediterranean cult can be deciphered only in terms of a worldview that placed the powers controlling human destiny not on the earth but in the stars

By David Ulansey


  • 50 and 100 Years Ago: December 1989

  • Range War

  • Photogenic Science

  • Fuel for Thought

  • The Lost Generation

  • After the Deluge

  • A Cosmic Unveiling

  • Big-Game Forensics

  • What's a Hoatzin?

  • Old Gene, New Trick

  • Stone to Bone

  • Affirmative Action

  • Nobel Prizes

  • Gaia

  • Manufacturing Intelligence

  • Pourable Plastics

  • Economic Intrigue

  • Letters

    Letters to the Editors, December 1989

  • Recommended

    Books, December 1989

  • Amateur Scientist

    The Amateur Scientist, December 1989

  • Departments

    The Analytical Economist: The Imbalance of Payments

  • Computer Recreations, December 1989

  • Annual Index, 1989

  • Essay: How to Control U.S. Health Costs

Purchase To Read More

Already purchased this issue? Sign In to Access
Select Format
Scroll To Top