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Enforcing the Clean Air Act of 1970

The act calls for the substantial reduction of pollutants by 1975. Its provisions are now the subject of many adversary proceedings. In the long run a new kind of cost-benefit analysis may be needed...

By Noel de Nevers

The Anchovy Crisis

Over the past decade the world's largest fishery has been in the Peru Current. A periodic ecological disturbance, combined with the heavy fishing, now threatens to destroy the industry

By C. P. Idyll

The Dynamics of the Andromeda Nebula

The stars, dust and gas of this spiral galaxy are all in motion. Spectrographic observations show that they do not simply wheel around the galactic center but move in a quite complex pattern...

By Vera C. Rubin

Ultrafast Phenomena in Liquids and Solids

Intense laser pulses a trillionth of a second in duration are harnessed to probe the extremely rapid energy-transfer times characteristic of events in the submicroscopic world

By R. R. Alfano and S. L. Shapiro

Electronic Numbers

Numeric displays are now seen not only on laboratory and industrial devices but also on pocket calculators and wristwatches. Deciding what kind of display to use involves both technology and economics...

By Alan Sobel

Life in Tall Trees

The high forest canopy consists of more than branches and leaves. Entire communities of other plants and animals dwell within this unique ecosystem, helping to provide the trees with nitrogen...

By William C. Denison

The Human Lymphocyte as an Experimental Animal

Maintained through many generations in laboratory cultures, the cells that make antibody lend themselves to studies of cell differentiation and diseases incolving the immune system, which may include cancer...

By Frank J. Dixon and Richard A. Lerner

An Advice-Taking Chess Computer

It has now been 24 years since Claude Shannon outlined how a computer could play chess. Here is a description of the first machine able to take lessons from a master

By Albert L. Zobrist and Frederic R. Carlson


  • 50 and 100 Years Ago, June 1973

  • Science and the Citizen, June 1973

  • Letters

    Letters to the Editors, June 1973

  • Recommended

    Books, June 1973

  • Mathematical Recreation

    Mathematical Games, June 1973

  • Amateur Scientist

    The Amateur Scientist, June 1973

  • Departments

    The Authors, June 1973

  • Bibliography, June 1973

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