Political Factors in Economic Assistance
It is argued that the global downward trend in aid from the rich countries to the poor countries can be reversed only by stressing the moral argument
Features
Collective-Effect Accelerators
The collective "self-fields" generated by intense beams of electrons can be harnessed to accelerate positive particles to high energies. In one case the electrons are first curled into ring-shaped clusters...
An Earlier Agricultural Revolution
It has generally been assumed that man first domesticated plants and animals in the Middle East. Excavations in Southeast Asia now suggest that there the revolution began some 5,000 years earlier...
Tides and the Earth-Moon System
Tidal friction in shallow waters has controlled the evolution of the earth-moon system for aeons. It is causing the length of the day to increase and the moon to recede from the earth
The Structure and History of an Ancient Protein
To oxidize food molecules all organisms from yeasts to man require a variant of cytochrome c. Differences in this protein from species to species provide a 1.2-billion-year record of molecular evolution...
Language and the Brain
Aphasias are speech disorders caused by brain damage. The relations between these disorders and specific kinds of brain damage suggest a model of how the language areas of the human brain are organized...
Superconductors for Power Transmission
The rising demand for electricity conflicts with opposition to overhead transmission lines. Underground lines that are refrigerated to be superconducting may provide a solution
Environmental Control in the Beehive
Honeybees efficiently regulate temperature and humidity, eliminate polluted air, remove foreign objects, wastes and dead bodies and control parasites and pathogens that attack them and their food...
Departments
50 and 100 Years Ago: April 1972
Science and the Citizen: April 1972
- Letters
Letters to the Editors, April 1972
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
