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Features

Military Technology and National Security

The ABM debate is analyzed in the context of a larger dilemma: the futility of searching for technological solutions to what is essentially a political problem

By Herbert F. York

"Genetic Drift" in an Italian Population

Studies of blood-group frequencies and consanguineous marriages among the people of the Parma Valley indicate that this random change in hereditary type distinctly influences human evolution

By Luigi Luca Cavalli-Sforza

Metalliding

With an electrolytic bath consisting of a hot molten fluoride, atoms of one metal can be made to diffuse deep into the surface of another. The result is a wide range of materials with new surface properties

By Newell C. Cook

The Size and Shape of Atomic Nuclei

Some nuclei are spherical, some are ellipsoidal and some fluctuate in between. Measurements of radius and precise shape provide tools with which theoretical physicists can refine models of the nucleus

By Michel Baranger and Raymond A. Sorensen

Keratins

These proteins are the stuff of hair, feather, horn, claw, nail, quill, hoof, beak, scale and the outer layer of skin. Their intricate molecular architecture is being revealed

By R. D. B. Fraser

The Weddell Seal

This Antarctic mammal can swim under the ice for more than an hour without coming up for air. How is it able to find its way back to its breathing hole, particularly during the long Antarctic night?

By Gerald L. Kooyman

Rudolf Diesel and his Rational Engine

The inventor of the Diesel engine hoped it would attain the ideal of the Carnot cycle for the heat engine. He failed, but today his engine provides most of the motive power for heavy transportation

By Lynwood Bryant

Departments

  • 50 and 100 Years Ago: August 1969

  • Science and the Citizen: August 1969

  • The Petroglyphs of Siberia

  • Letters

    Letters to the Editors, August 1969

  • Recommended

    Books

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Bibliography

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August 1969

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