The Economics of Technological Change
The effects of such change are brought out by a comparison of input-output tables listing the transactions among all sectors of industry in the U.S. for the years 1947 and 1958
Features
Chemical Lasers
If a laser could be made to work by a chemical reaction, it would need no external source of power. Two experimental chemical-laser systems, both of which emit in the infrared, have now been found...
Chromosome Analysis by Computer
Now that certain human disorders have been linked with chromosome abnormalities, it is desirable to examine large numbers of cells for such abnormalities. A computer regime has been devised for the purpose...
The Photographs from Mariner IV
How they were made and what they show is reviewed. The second of three articles on the remarkably successful Mariner mission
Early Metallurgy in the New World
In 4000 B.C. the people of the Great Lakes region were hammering tools out of native copper. By the time of Columbus the gold work of cultures from Peru to Mexico rivaled the best in the Old World...
Sex Differences in the Brain
There is increasing evidence that mammalian behavior patterns are basically female and that male patterns are induced by the action of the sex hormone testosterone on the brain of the newborn animal...
The Muonium Atom
This recently discovered atom consists of only two elementary particles: a positive muon and an electron. A study of its energy levels has yielded precise new information that pertains to all electromagnetic interactions...
Antibiotics and the Genetic Code
The meaning of the code that directs the synthesis of proteins can be changed by the action of streptomycin and related drugs. They cause "misreading" by altering the structure of ribosomes...
Departments
50 and 100 Years Ago: April 1966
Science and the Citizen: April 1966
- Letters
Letters to the Editors, April 1966
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
