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The solar system's most active volcanic world is a moon of Jupiter whose geyser like eruptions and massive lava flows yield evidence of exotic volcanic fluids. Their source of energy is gravitational

By Torrence V. Johnson and Laurence A. Soderblom

An Early Iron Age Farm Community in Central Europe

Excavations at a site in Bavaria unearth clues to an economy of 1000 to 800 B. C. in which farmers were just beginning to exchange their surplus for the work of specialized craftsmen

By Peter S. Wells

Prey Switching in a Simple Ecosystem

On the island of Newfoundland, which has few species of mammals, lynxes preyed on snowshoe hares until the hare population "crashed." Then the lynxes switched to caribou calves, and the cycle continues

By Arthur T. Bergerud

The Aerodynamics of Human-Powered Land Vehicles

A bicycle and its rider are strongly impeded by their resistance to the Row of air. Aerodynamic stratagems have brought vehicles that can go 60 mlies per hour on a level road without assistance

By Albert C. Gross, Chester R. Kyle and Douglas J. Malewicki

The Interpretation of Visual Illusions

The visual system apparently organizes ambiguous retinal images according to rules of inference that exploit certain regularities in the external world

By Donald D. Hoffman


  • 50 and 100 Years Ago: December 1983

  • Modern Icebreakers

  • Science and the Citizen, December 1983

  • The DNA Helix and How it is Read

  • Quantum Gravity

  • Letters

    Letters to the Editor, December 1983

  • Recommended

    Books, December 1983

  • Amateur Scientist

    The Amateur Scientist, December 1983

  • Departments

    The Authors, December 1983

  • Computer Recreations, December 1983

  • Annual Index 1983

  • Bibliography, December 1983

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December 1983

Think Outside the Gift Box