The Great Test-Ban Debate
The trend of events in weaponry and in arms control tends to refute arguments presented a decade ago against a limited nuclear-test ban and to indicate that the time may be ripe for a comprehensive test ban...
Features
The Hormones of the Hypothalamus
The anterior pituitary gland, which controls the peripheral endocrine glands, is itself regulated by "releasing factors" originating in the brain. Two of these hormones have now been isolated and synthesized...
Microcircuits by Electron Beam
By using an electron beam to trace the patterns of electronic circuits it should soon be possible to put 100,000 transistors and similar devices on a silicon chip a few millimeters square...
Continental Drift and the Fossil Record
Similarities between the fossils found in widely separated areas led to the first theories of continental drift. Today's advocates of plate-tectonic theory are also supported by the fossil record...
The Social Behavior of Army Ants
The complex and permanent social organization of these insects is maintained by interactions among a great nlany individuals. Each individual, however, can alter its behavior only slightly...
Pictorial Perception and Culture
Do people of one culture perceive a picture differently from people of another? Experiments in Africa show that such differences exist, and that the perception of pictures calls for some form of learning...
The Structural analysis of Gothic Cathedrals
Comparison of Chartres and Bourges by optical stress analysis relates the aesthetic achievement to structural imperatives and suggests that later Gothic cathedrals may have been patterned on the wrong building...
Exotic Atoms
An electron in an atom can be briefly replaced with another particle. The resulting new atom yields information on the nature of the nucleus
Departments
50 and 100 Years Ago, November 1972
Science and the Citizen, November 1972
- Letters
Letters to the Editors, November 1972
- Recommended
Books, November 1972
- Mathematical Recreation
Mathematical Games, November 1972
- Amateur Scientist
The Amateur Scientist, November 1972
- Departments
The Authors, November 1972
Bibliography, November 1972
