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Features

Science Policy in the U.S.S.R.

A new study shows that the U.S.S.R. operates a research and development establishment comparable in size to that of the U.S. The differences between the two are getting fewer

By R. Amann and R. W. Davies

Nuclear Tracks in Solids

Charged particles leave damage trails in nonconducting solids such as mineral crystals, glasses and plastics. The etched tracks provide information on the age of the solid or the nature of the particles

By P. B. Price, R. L. Fleischer and R. M. Walker

Wound Healing

In man and other higher animals an intricate, three-step process involving a variety of cells renews injured tissue. Studies of this process could yield ways of controlling several diseases

By Russell Ross

Truth and Proof

The antinomy of the liar, a basic obstacle to an adequate definition of truth in natural languages, reappears in formalized languages as a constructive argument showing not all true sentences can be proved

By Alfred Tarski

Hormones in Social Amoebae and Mammals

The substance that attracts social amoebae to one another to form a sluglike mass has recently been identified. It turns out that the same substance also acts as a "messenger" in mammalian cells

By John Tyler Bonner

Ultraviolet Astronomy

Telescopes now in orbit are measuring the ultraviolet radiation from celestial objects that never penetrates the earth's atmosphere. The results may significantly alter man's view of the universe

By Leo Goldberg

The Phalarope

The reproductive behavior of this aquatic shorebird is most unusual. The female phalarope aggressively courts the male; the male phalarope warms the eggs and rears the young birds

By E. Otto Hohn

Analytic Instruments in Process Control

Self-regulating manufacturing processes call for systems that sensitively monitor the performance of the process. An example of such a system is a gas chromatograph linked to a computer

By F. W. Karasek

Departments

  • 50 and 100 Years Ago: June 1969

  • Science and the Citizen: June 1969

  • Letters

    Letters to the Editors, June 1969

  • Recommended

    Books

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Bibliography

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June 1969

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