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Features

Labor-Intensive Agriculture

The $18-billion U.S. fruit and vegetable industry is increasingly reliant on illegal-immigrant labor. By postponing mechanization it is becoming vulnerable to cheaper produce from other countries

By Philip L. Martin

The Engineering of Magnetic Fusion Reactors

Design projects under way and experimental reactors now being built will test the practicality of schemes for generating power from the thermonuclear fusion of ions trapped by magnetic fields

By Robert W. Conn

The Dead Sea

Five years ago the world's most hypersaline lake "turned over" dissipating a dense body of fossil brine that had been isolated from any contact with the atmosphere by fresher water above it

By Joel R. Gat and Ilana Steinhorn

Six Millenniums of Buffalo Kills

At a site in western Canada named Head-Smashed-In, Indian hunters slaughtered buffalo by stampeding the herd over a cliff. They started in 3700 B. C. and continued until well after the white men had come

By B. O. K. Reeves

The Extinction of the Ammonites

Changes in the shells of these nautliuslike marine animals at the end of their long history suggest they were fighting a losing battle against more mobIle, shell-crushing predators

By Peter Ward

Bilateral Negotiations and the Arms Race

A historical review of the negotiating positions of the U.S and the U.S.S.R. in several major arms-control talks suggests that each side has special problems in dealing with the other

By Herbert F. York

Departments

  • 50 and 100 Years Ago: October 1983

  • The Large-Scale Structure of the Universe

  • Science and the Citizen, October 1983

  • The Processing of RNA

  • Letters

    Letters to the Editors, October 1983

  • Amateur Scientist

    The Amateur Scientist, October 1983

  • Departments

    The Authors, October 1983

  • Computer Recreations, October 1983

  • Books, October 1983

  • Bibliography, October 1983

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