Chemical Prospecting
The modern prospector may carry not only a Geiger counter but also test tubes and plastic bottles filled with chemicals. With them he can detect the traces of metal which surround a hidden body of ore...
Features
The Absorption of Radio Waves in Space
In 1951 it was found that clouds of hydrogen between the stars radiate 21-centimeter radio, waves. The clouds also absorb these waves, providing a sensitive new tool for the radio astronomer...
Weed Control by Insect
For 30 years Klamath weed, a noxious plant imported from Europe, had infested the range lands of northern California. How it was brought under control by introducing its European insect enemies...
Elementary Particles
An account of the abstract theoretical ideas which physicists use to help them understand the material world. These ideas begin to show some order in the jumble of subatomic particles
Agammaglobulinemia
This nonstop word refers to a disease in which the blood lacks gamma globulin. Because antibodies are found in gamma globulin, those who suffer from the disease are prey to grave infections...
The Tombs of the First Pharaohs
Before the kings of Egypt made pyramids, they were buried in great brick-lined pits topped by rectangular buildings. These structures provide clues as to how civilization came to the Valley of the Nile...
The Geography of Birds
Although they are free to fly wherever they please, few birds are cosmopolitan. After 150 million years of evolution in a constantly changing environment, most species are confined to provincial abodes...
Powerhouse of the Cell
It is the mitochondrion, a small body which appears to play a central role in the oxidation of foodstuff. Its structure, as revealed by the electron microscope, mirrors its function
Departments
50 and 100 Years Ago: July 1957
Science and the Citizen: July 1957
- Letters
Letters to the Editors, July 1957
Erratum and Addendum
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
