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Enhanced-Radiation Weapons

Although President Carter has deffered production of the "neutron bomb" it is still an alternative of U.S policy. It remains a weapon of doubtful utility that could result in an all-out nuclear exchange...

By Fred M. Kaplan

When the Black Sea was Drained

Less than six million years ago rivers feeding the Black Sea were diverted into the dry basin of the Mediterranean. After a period of desiccation the Black Sea was until recently a freshwater lake...

By Kenneth J. Hsü

The Cosmic Background Radiation and the New Aether Drift

Sensitive instruments have found slight departures from uniformity In the radiation left by the primordial "big bang". The experiment reveals the earth's motion with respect to the universe as a whole...

By Richard A. Muller

Ultrasound in Medical Diagnosis

With ultrahigh-frequency sound waves and imaging techniques first devised for radar and sonar, it is now possible to explore structures within the human body painlessly, safely and at relatively low cost...

By Gilbert B. Devey and Peter N. T. Wells

The Lek Mating System of the Sage Grouse

In a lek system a large percentage of the females mate with a small percentage of the males. How the system operates among the sage grouse of the Rockies is examined in detail

By R. Haven Wiley

The Adjacency Principle in Visual Perception

The visual system integrates information about objects from different sources including relative, or contextual, cues. The adjacency principle describes how relative cues are weighted to achieve this integration...

By Walter C. Gogel

Junctions between Living Cells

Where the cells of certain key animal tissues meet they do not simply touch. They are linked by specialized structures, the architecture of which is revealed by electron microscopy

By Barbara E. Hull and L. Andrew Staehelin

Roman Hydraulic Technology

The achievements of the Romans in impounding, moving and delivering water on a large scale were not matched for 1,500 years. The aqueduct systems in particular embodied many remarkable feats of engineering...

By Norman Smith


  • 50 and 100 Years Ago, May 1978

  • Science and the Citizen, May 1978

  • Letters

    Letters to the Editors, May 1978

  • Mathematical Recreation

    Mathematical Games, May 1978

  • Amateur Scientist

    The Amateur Scientist, May 1978

  • Departments

    The Authors, May 1978

  • Books, May 1978

  • Bibliography, May 1978

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