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Features

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

By Jeffrey Frey and Raymond Bowers

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

By C. Fred Fox

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

By James L. Flanagan

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

By Arthur Ashkin

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

By K. I. Kellermann

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

By Robert Keith Wallace and Herbert Benson

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

By William L. Langer

Departments

  • 50 and 100 Years Ago: February 1972

  • Brain Changes in Response to Experience

  • 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

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February 1972

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