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World Uranium Resources

A case study in the estimation of mineral resources, supported by U.S. mining records, indicates that the supply of uranium will not be a limiting factor in the development of nuclear power

By Kenneth S. Deffeyes and Ian D. MacGregor

The Origins of the Water Turbine

How did the water wheel evolve into the water turbine, the machine that converts a head of water into shaft power and provides a fourth of the world's electricity?

By Norman Smith

The Next Generation of Particle Accelerators

The smallest of objects can be perceived only with the largest of instruments. Penetrating deeper into the structure of matter may require accelerators built with multinational sponsorship

By Robert R. Wilson

The Galilean Moons of Jupiter

In viewing the four largest Jovian satellites last year the Voyager spacecraft increased to nine the number of earthlike bodies that can be closely compared to gain an understanding of how they evolved

By Laurence A. Soderblom

The Cell Biology of Human Aging

When normal human cells grow in laboratory glassware, they eventually lose the ability to function and divide. The timing of this loss may well represent the limit of the human life span

By Leonard Hayflick

The Ancestry of Corn

The progenitor of modern corn is probably the wild grass known as teosinte. The hypothesis has been disputed, but it is supported by new evidence from plant breeding, archaeology and folklore

By George W. Beadle


This ancient scourge of man is perpetuated by infected wild animals, notably skunks, bats and foxes. The classic Pasteur vaccine treatment can now be replaced by a shorter and less painful series of inoculations

By Martin M. Kaplan and Hilary Koprowski

Geometrical Illusions

In these classic figures of psychology lines appear different from the way they really are. The effects appear to be related to clues to the size of objects in the three-dimensional world

By Barbara Gillam


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