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Features

The Pluralistic Economy of the U.S.

One worker in three is employed in the not-for-profit sector. This fact calls into question some traditional conceptions of the economy and suggests new approaches to gaining a fuller understanding of it

By Eli Ginzberg

The Reprocessing of Nuclear Fuels

The economics of fission power would be much improved if spent fuel were processed to remove fission products and plutonium and reclaim uranium. The industry needed for the task does not yet exist in the U. S.

By William P. Bebbington

Negative Aftereffects in Visual Perception

You will see one if you stare at a waterfall for a short time and then look away; the surrounding scene will seem to move slowly upward. The study of such illusions yields information on perceptual systems

By Michael C. Corballis and Olga Eizner Favreau

Superfluid Helium 3

At a temperature a few thousandths of a degree above absolute zero this isotope of helium becomes able to flow through tiny pores without friction and exhibits bizarre magnetic effects

By David M. Lee and N. David Mermin

The Control of Walking

Recent experiments indicate that the mechanism by which the nervous system generates the rhythmic movements of the leg during walking is basically the same in animals as diverse as the cat and the cockroach

By Keir Pearson

Supernovas in Other Galaxies

These stellar cataclysms occur about once every 50 years in a galaxy. Therefore the nature of supernovas can best be investigated in galaxies outside our own

By Rober P. Kirshner

How Viruses Insert Their DNA Into the DNA Of the Host Cell

Some Viruses are able to coexist peaceably with their host cell for long periods, incorporating their genes into the host chromosome. The details of the insertion process are now fairly well understood

By Allan M. Campbell

Fission-Track Dating

The tracks left by the spontaneous fission of traces of uranium in many minerals are clues to the minerals' age. One of the main advantages of the technique is the broad span of time it covers

By J. D. Macdougall

Departments

  • 50 and 100 Years Ago, December 1976

  • Science and the Citizen, December 1976

  • Letters

    Letters to the Editors, December 1976

  • Recommended

    Books, December 1976

  • Mathematical Recreation

    Mathematical Games, December 1976

  • Departments

    The Authors, December 1976

  • Annual Index 1976

  • Bibliography, December 1976

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December 1976

Think Outside the Gift Box