Missile Submarines and National Security
Land-based missiles are giving way to submarine missiles as a secure deterrent to a nuclear first strike. The question now is whether or not the U.S. should spend perhaps $40 billion on a new missile fleet
Features
Markers of Biological Individuality
The rejection of transplanted organs has focused attention on the body's ability to distinguish foreign cells from its own. The cells of each individual are uniquely marked with protein
Organic Matter in Meteorites
The meteorites known as carbonaceous chondrites contain organic compounds. These compounds have now been subjected to detailed analyses which indicate that they are not of biological origin
The Evolution of Reefs
The community of plants and animals that builds tropical reefs is descended from an ecosystem of two billion years ago. The changes in this community reflect major events in the history of the earth
Temperature Control in Flying Moths
The flight muscles of certain insects cannot function properly until they have been warmed up by a process that resembles shivering. The system also keeps the insect from overheating
Nonstandard Analysis
This mathematical theory has restored infinitesimals to good standing. They had been employed since antiquity, but often with doubts, to solve such problems as finding a circle's area
Contour and Contrast
We see contours when adjacent areas con trast sharply. Surprisingly, certain contours, in turn, make large areas appear lighter or darker than they really are. What neural mechanisms underlie these effects?
Psychological Factors in Stress and Disease
A new technique separates the psychological and physical factors in stressful conditions. In studies with rats the psychological factors were the main cause of stomach ulcers and other disorders
Departments
50 and 100 Years Ago, June 1972
Science and the Citizen, June 1972
- Letters
Letters to the Editors, June 1972
- Recommended
Books, June 1972
- Mathematical Recreation
Mathematical Games, June 1972
- Amateur Scientist
The Amateur Scientist, June 1972
- Departments
The Authors, June 1972
Bibliography, June 1972
