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Features

The Social Power of the Negro

How is it that immigrants such as the Irish and the Italians have been able to evolve group power in the U.S., whereas Negroes have not? The principal reason is an unrecognized disunity among Negroes

By James P. Comer

The Induction of Cancer by Viruses

Normal cells cultured in glassware can be transformed into cancer cells by several viruses. Such "model" systems are studied to find how the virus, with fewer than 10 genes, can produce the change

By Renato Dulbecco

The Changing Helicopter

The unique capabilities of this improbable flying machine make it adaptable to many purposes. Because of recent improvements future models will have more speed, maneuverability and carrying capacity

By Alfred Gessow

The Antiquity of Human Walking

Man's unique striding gait may be the most significant ability that sets him apart from his ancestors. A big-toe bone found in Tanzania is evidence that this ability dates back more than a million years

By John Napier

Neutron-Activation Analysis

This powerful analytic tool is now routinely used in a wide range of disciplines to measure the concentrations of trace elements, often in amounts less than a billionth of a gram

By Werner H. Wahl and Henry H. Kramer

Rivers in the Making

In various parts of the world water drains from the land not in distinct streams and rivers but in strangely interlaced channels. It seems that such drainage is a stage in the evolution of rivers

By H. F. Garner

The Evolution of Bee Language

Different species of bees communicate In different ways. When primitive bees are compared with more advanced ones, it seems that communication by sound preceded communication by dancing

By Harald Esch

Antimatter and Cosmology

Experiments in high-energy physics have demonstrated the complete symmetry between particles and antiparticles. A novel theory of the universe that takes this basic symmetry into account is advocated

By Hannes Alfvén

Departments

  • 50 and 100 Years Ago: April 1967

  • Science and the Citizen: April 1967

  • Letters

    Letters to the Editors, April 1967

  • Recommended

    Books

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Bibliography

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April 1967

Think Outside the Gift Box