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Features

Orthodox and Unorthodox Methods of Meeting World Food Needs

The orthodox methods must be pressed, but it seems they cannot solve the problem without the aid of the unorthodox ones. And the adoption of unorthodox methods calls for basic changes in cultural attitudes

By N. W. Pirie

The Repair of DNA

The two-strand molecule that incorporates the genetic information of the living cell is subject to damage. Experiments with bacteria reveal that the cell has a remarkable ability to repair such damage

By Robert H. Haynes and Philip C. Hanawalt

The States of Sleep

Light and deep sleep differ physiologically, deep sleep having much in common with being awake. Studies with cats now suggest that the two states of sleep are induced by different biochemical secretions

By Michel Jouvet

Controlled Eutectics

A combination of metals with a particularly low melting point is called a eutectic. By controlling the way a eutectic solidifies It is possible to produce alloys with a host of useful properties

By R. Wayne Kraft

Medical Thermography

Measurement of the heat emitted through the skin at various points on the body has proved valuable In the diagnosis of such disorders as tumors and arthritis and In observing the effects of treatment

By Jacob Gershon-Cohen

Living Prehistory in India

In India, as in many other lands, herdsman has succeeded hunter and farmer has succeeded both. A study of tribal groups that still pursue these ancient livelihoods helps to illuminate a shadowy past

By D. D. Kosambi

Departments

  • 50 and 100 Years Ago: February 1967

  • Reversals of the Earth's Magnetic Field

  • Science and the Citizen: February 1967

  • The Solvated Electron

  • Letters

    Letters to the Editors, February 1967

  • Recommended

    Books

  • Bibliography

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

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February 1967

Think Outside the Gift Box