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The Yields of Soviet Strategic Weapons

They have been generally overestimated. Recalculated yield estimates of Soviet weapon tests indicate that U.S.S.R. compliance with treaty limits has restrained its development of strategic nuclear warheads...

By Dan M. Davis and Lynn R. Sykes


The giant blue-green planet visited last January by Voyager 2 has one pole pointing toward the sun, and its magnetic field is askew. Its atmosphere is dense and icy, yet its winds resemble the earth's...

By Andrew P. Ingersoll

The AIDS Virus

Part II of a two-part article on the human retroviruses. In 1984 the cause of AIDS was shown to be the third human retrovirus. Although knowledge of the virus was rapidly obtained, its toll will be heavy...

By Robert C. Gallo

Learning by Instinct

Usually seen as diametric opposites, learning and instinct are partners: the process of learning, in creatures at all levels of mental complexity, is often initiated and controlled by instinct...

By James L. Gould and Peter Marler

Power from the Sea

Electricity can be generated by exploiting the temperature difference between warm surface water and cold bottom water. The technology will be useful when oil supplies become scarce

By Desikan Bharathan and Terry R. Penney

Fractal Growth

Growth in nature can produce the sprawling, tenuous patterns called fractals. One kind of fractal growth explains such diverse phenomena as how some solids crystallize and how air bubbles move in fluids...

By Leonard M. Sander


These lipid spheres may offer a novel way to deliver medicines to diseased tissues. Instead of being diluted in the blood, drugs put in the vesicles would reach target sites in concentrated doses...

By Marc J. Ostro

The Evolution of the Fleece

Features of the sheep's coat and the rise of textile crafts in teracted to motivate the thousands of years of selective breeding that led to modern fleece types

By Michael L. Ryder


  • 50 and 100 Years Ago: January 1987

  • Science and the Citizen, January 1987

  • Letters

    Letters to the Editors, January 1987

  • Recommended

    Books, January 1987

  • Amateur Scientist

    The Amateur Scientist, January 1987

  • Departments

    The Authors, January 1987

  • Computer Recreations, January 1987

  • Bibliography, January 1987

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