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Features

Soybeans

Now in a class with wheat and not far behind corn as a major U.S. crop, they have become one of the nation's main exports. They are thus playing an important role in balancing payments for imports

By Folke Dovring

Charge-Coupled Devices

The products of a new concept in semiconductor electronics, they hold considerable promise in applications as diverse as image sensors and information–storage elements for computer memories

By Gilbert F. Amelio

Slow, Inapparent and Recurrent Viruses

Certain viruses can persist in their host without giving rise to the usual signs of infection. Evidence is accumulating that such viruses can cause or trigger chronic degenerative disease in man

By John J. Holland

The Nature of Comets

Although Comet Kohoutek was a disappointment to visual observers, it provided a good opportunity for the study of one of the objects that may be relics of the cloud from which the sun and the planets formed

By Fred L. Whipple

The Cooperative Action of Muscle Proteins

Muscle fibers are composed of four major proteins: myosin, actin, tropomyosin and troponin. The contraction of muscle is a function of their interactions, controlled by the presence of calcium ions

By John M. Murray and Annemarie Weber

The Batavia Accelerator

The great Illinois synchrotron is currently accelerating protons to energies up to 400 GeV (billion electron volts). Its designers hope to reach 1,000 GeV with a new superconducting–magnet ring

By R. R. Wilson

Nutrition and the Brain

When a meal rich in carbohydrate is eaten, the brain makes more of the nerve impulse transmitter serotonin. The mechanism may be part of a closed circle in which diet influences food consumption

By John D. Fernstrom and Richard J. Wurtman

The Wind Bracing of Buildings

The evolution of the skyscraper has inspired elaborate methods for providing resistance to the wind. In the largest buildings a technique invented more than 100 years ago has been revived

By Carl W. Condit

Departments

  • 50 and 100 Years Ago, February 1974

  • Science and the Citizen, February 1974

  • Letters

    Letters to the Editors, February 1974

  • Recommended

    Books, February 1974

  • Mathematical Recreation

    Mathematical Games, February 1974

  • Amateur Scientist

    The Amateur Scientist, February 1974

  • Departments

    The Authors, February 1974

  • Bibliography, February 1974

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February 1974

Think Outside the Gift Box