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
Volume 238, Issue 5
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Features
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
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
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
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
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
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
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