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Features

Testing Weapons in Space

Would,a more permissive weapon-testing regime than is set forth in the Antiballistic-Missile Treaty be in the u.s. interest? Reviewing the rationale of the treaty's provisions helps to answer the question

By Ashton B. Carter

Memory Storage and Neural Systems

Changes in the electrical and molecular properties of nerve cells accompany the learning that takes place in Pavlovian conditioning. The changes offer lessons for the design of artificial networks

By Daniel L. Alkon

Spin Glasses

Their traits arise from disorderly, discordant magnetic interactions among atoms. Mathematical models of spin glasses are prototypes for complex problems in computer science, neurology and evolution

By Daniel L. Stein

Volcanism at Rifts

When the earth's rigid shell is rifted, the ductile rock of the mantle wells up and partially melts. Spectacular volcanic outbursts ensue when the mantle is only slightly hotter than normal

By Dan P. McKenzie and Robert S. White

The Gastrointestinal Tract in Growth and Reproduction

It is the largest endocrine gland in the body, and it has a significant role in the readjustment of metabolism that accompanies pregnancy as well as fetal and infant growth

By Kerstin Uvnäs-Moberg

Space Coloristics

The earth's surface presents an irreproducible palette to observers in orbit. Accurate reporting of its colors can reveal new facets of both nature and human vision

By Artur A. Tishchenko and Vladimir V. Vasyutin

Visual Thinking in the Ice Age

After some 2.5 million years in which the archaeological record reveals very little innovation, body ornamentation and visual images explode onto the scene in Europe about 35,000 years ago

By Randall White

Synthetic Zeolites

In the past 30 years man-made analogues of porous minerals called zeolites have revolutionized aspects of the petroleum industry. The search for novel commercially applicable forms continues apace

By George T. Kerr

Departments

  • 50 and 100 Years Ago: July 1989

  • Cosmic Collisions

  • Science Gains a Voice

  • Moscow Subversive Chic

  • Stradivari's Secret (Redux)

  • Squaring the Circle

  • Jukeboxes for Scientists

  • Molecular Archaeology

  • Alien Influence

  • Ripe for a Change

  • Sweet Success

  • Ethnography as Art

  • Show and Tell

  • Quality Conscious

  • A Connoisseur's SNIF

  • Letters

    Letters to the Editors, July 1989

  • Recommended

    Books, July 1989

  • Departments

    The Analytical Economist: CPI and Inflation

  • Computer Recreations, July 1989

  • Essay: From Descartes to Neural Networks

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July 1989

Think Outside the Gift Box