The Cratering of Indochina
The countries of the area are pitted with an estimated 26 million bomb and shell craters. What are the long-term ecological effects of this massive physical alteration of the terrain likely to be?...
Features
How we control the contraction of our muscles
Voluntary muscular movements are driven by a servomechanism similar in many respects to the automatic feedback system employed to control power-assisted steering in an automobile
Black Holes
If a massive star collapsed to a sufficiently small volume, light could not escape from it. A rotating black hole could account for the radiation of gravitational waves from the center of the galaxy...
Plate Tectonics
The earth's surface is divided into a mosaic of rigid, shifting plates. As they move apart, slide past each other and converge, new crust is generated, continents drift and mountains are formed...
Total Intravenous Feeding
It is now possible to feed a person entirely by vein for prolonged periods. The technique provides sufficient calories, amino acids and other nutrients to promote growth, weight gain and wound healing...
The Planning of a Maya Ceremonial Center
The center at Lubaantún in British Honduras called for a huge investment in labor and materials. When a choice had to be made between cutting costs and adhering to the plan, the plan won out...
Tree Rings and Climate
It is well known that tree rings reflect the age of a tree. Variations in the ring pattern of many trees in a region can be statistically analyzed to determine climates of the past
The Great Automobile Race of 1895
This event, covering a difficult 1,200-kilometer course from Paris to Bordeaux and back, established the viability of the automobile and the superiority of the internal-combustion engine over steam...
Departments
50 and 100 Years Ago: May 1972
Science and the Citizen: May 1972
- Letters
Letters to the Editors, May 1972
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
