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Health Maintenance Organizations

A decade ago the Federal Government endorsed the concept of prepaid medical care. Today the number of HMO's is less than was envisioned then, but it is nevertheless increasing

By Ernest W. Saward and Scott Fleming

The Bizarre Spectrum of SS 433

Displaced emission lines found in the spectrum of this extraordinary stellar object suggest that it is spewing two narrow high-speed jets of matter in opposite directions. How can such behavior be explained?...

By Bruce Margon

Monoclonal Antibodies

Cells that secrete antibodies can be made immortal by fusing them with tumor cells and cloning the hybrids. Each clone is a long-term source of substantial quantities of a single highly specific antibody...

By Cesar Milstein

The Causes of Color

They are diverse, but they all stem from the same root: It is the electrons in matter, through their varied responses to different wavelengths of light, that make the world a many-colored place...

By Kurt Nassau

The Southern Appalachians and the Growth of Continents

A large seismic-reflection survey suggests that for at least half of the history of the earth continents have evolved by the stacking and shuffling of relatively thin sheets of material at their margins...

By Frederick A. Cook, Larry D. Brown and Jack E. Oliver

Positron-Emission Tomography

This technique displays the concentration of radioactively labeled substances in the living body with improved clarity. It holds much promise for both biological investigations and clinical diagnosis...

By Michel M. Ter-Pogossian, Marcus E. Raichle and Burton E. Sobel

Oil Mining

Conventional drilling and pumping removes less than half of the oil in an average petroleum reservoir. As the price of oil rises, mining it underground or at the surface becomes economically more attractive...

By Richard A. Dick and Sheldon P. Wimpfen

The Buoyancy of the Chambered Nautilus

The animal trims its weight and gains mobility by dividing its shell into compartments and removing their watery content. It succeeds in spite of the ocean's pressure, which tends to drive water back in...

By Peter Ward, Lewis Greenwald and Olive E. Greenwald


  • 50 and 100 Years Ago, October 1980

  • Science and the Citizen, October 1980

  • Letters

    Letters to the Editors, October 1980

  • Recommended

    Books, October 1980

  • Mathematical Recreation

    Mathematical Games, October 1980

  • Amateur Scientist

    The Amateur Scientist, October 1980

  • Departments

    The Authors, October 1980

  • Bibliography, October 1980

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