Photography by Laser
The highly coherent light produced by the laser is used in a novel photographic process, in which the light-sensitive film, instead of recording an image, in effect records the light waves themselves...
Features
Hormones and Genes
One of the traditional questions of biology is: How do hormones exert their powerful effects on cells? Evidence is accumulating that many of these effects are due to the activation of genes...
The Magnetic Field of the Galaxy
Its role may be to stiffen the arms of the galaxy and hold them in place. By determining the polarization of incoming radiation radio telescopes have shown how the field is oriented in space...
Chemical Fertilizers
In a world that is obliged to produce more food, enriching the soil with elements that are needed for plant growth is a major concern. What are these elements and how can they be artificially supplied?...
The Flight Muscles of Insects
The wings of some insects beat hundreds of times per second. The two kinds of muscle that power insect flight give clues to the operation of muscle throughout the animal kingdom
Corona Chemistry
The electric discharge that results from the incomplete breakdown of a gas can be put to work as a chemical catalyst. The corona acts by creating numerous free radicals that mediate chemical reactions...
The Composition of the Earth's Interior
There is little likelihood that the core of the earth will ever be examined at first hand, but recent studies of solids at high pressures support the idea that it is made of iron and nickel...
William Withering and the Purple Foxglove
The foxglove yields the invaluable heart drug digitalis. Discovered at least as early as the 16th century, the drug fell into disrepute but was reinstated by the careful studies of an English physician...
Departments
50 and 100 Years Ago: June 1965
Science and the Citizen: June 1965
- Letters
Letters to the Editors, June 1965
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
