Technology Assessment and Microwave Diodes
The advent of cheap solid-state devices for the generation of microwaves provides a rare opportunity for attempting to predict the impact of a technological development on society
Features
Brain Changes in Response to Experience
Rats kept in a lively environment for 30 days show distinct changes in brain anatomy and chemistry compared with animals kept in a dull environment. The implications of these effects for man are assessed...
The Structure of Cell Membranes
The thin, sturdy envelope of the living cell consists of lipid, phosphate and protein. The proteins act as both gatekeepers and active carriers, determining what passes through the membrane...
The Synthesis of Speech
Electronic speaking machines capable of synthesizing output speech with no recourse to any vestige of human speech are in the process of development. They may provide articulate voices for computers...
Physics
The Pressure of Laser Light
The forces exerted by a focused beam of laser light are strong enough to push tiny particles around freely in various mediums. Several applications based on this recent finding are proposed...
Intercontinental Radio Astronomy
The structure of quasars and of other radio sources is being examined with interferometers consisting of radio telescopes separated by distances approaching the diameter of the earth
The Physiology of Meditation
Is the meditative state that is achieved by yogis and other Far Eastern mystics accompanied by distinct physiological changes? A study of volunteer subjects in the U.S. indicates that it is...
Checks on Population Growth: 1750-1850
In this period the population of Europe nearly doubled, but without certain checks it would have grown even more. There is much evidence that the checks were the widespread practice of celibacy and infanticide...
Departments
50 and 100 Years Ago: February 1972
Science and the Citizen: February 1972
- Letters
Letters to the Editors, February 1972
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
