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Advances in Antisubmarine Warfare

Continuing improvements in U.S. antisubmarine forces are becoming an important factor in the overall strategic military balance. They could well play a major role in future strategic-arms-limitation talks...

By Joel S. Wit

California Rice Culture

Sowing seed and herbicide by air and exploiting other modern agricultural methods, California rice growers achieve remarkably high yields that play an important role in the world rice market...

By J. Neil Rutger and D. Marlin Brandon

The Nucleosome

The elementary subunit of chromosome structure is a DNA superhelix wound on a spool made of histone proteins. Here is a report on the discovery of the nucleosome and the determination of its structure...

By Roger D. Kornberg and Aaron Klug

Autoimmune Diseases

Malfunctions of the immune system in which the body attacks its own tissues are now known to cause several enigmatic diseases. The details of such processes suggest new strategies of treatment...

By Noel R. Rose

The Activity Cycles of Stars

Variations in activity similar to the sun's 11-year sunspot cycle have been followed in 91 nearby stars. The study may reveal why the cycle arises and why it sometimes disappears, as the sun's cycle has in the past...

By Olin C. Wilson, Dimitri Mihalas and Arthur H. Vaughan


Neither dinosaurs nor birds, these creatures were flying reptiles that endured for 135 mlllion years. The ones with wingspans of 12 meters are thought to have been the largest animals ever to fly...

By Wann Langston Jr.

A Deep-Sea Neutrino Telescope

High-energy phenomena such as supernovas and X-ray double stars may emit a flood of neutrinos. An array of sensors shielded by five kilometers of water could selectively detect such particles...

By John G. Learned and David Eichler

The Nok Sculptures of Nigeria

These unique terra-cotta figures date back 2,500 years. Associated with both stone tools and early iron-smelting furnaces, they raise questions about the function of art and the definition of a culture...

By Thurstan Shaw


  • 50 and 100 Years Ago, February 1981

  • Science and the Citizen, February 1981

  • Letters

    Letters to the Editors, February 1981

  • Recommended

    Books, February 1981

  • Mathematical Recreation

    Mathematical Games, February 1981

  • Amateur Scientist

    The Amateur Scientist, February 1981

  • Departments

    The Authors, February 1981

  • Bibliography, February 1981

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