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Physical Disability and Public Policy

The civil rights of disabled Americans require a more accessible environment. The present Administration, however, hesitates to enforce laws calling for the removal of architectural barriers...

By Gerben DeJong and Raymond Lifchez

A Vector for Introducing New Genes into Plants

The induction of a plant tumor by a bacterium is a natural form of genetic engineering. The piece of DNA the bacterium injects may serve as a tool for the genetic modification of crop plants...

By Mary-Dell Chilton

Giant Volcanic Calderas

They are craters tens of kilometers in diameter that remain after eruptions far more violent than any in the span ofhuman history. Perhaps 10 of them have been created over the past million years...

By Peter Francis

Peking Man

In 230,000 years of cave dwelling Homo erectus pekinensis left an abundance of fossils and artifacts that now give information on biological, technological and perhaps even social evolution...

By Lin Shenglong and Wu Rukang

Dark Matter in Spiral Galaxies

It appears that much of the matter in spiral galaxies emits no light. Moreover, it is not concentrated near the center of the galaxies

By Vera C. Rubin

The Physiological Ecology of Whales and Porpoises

Like other mammals, these marine species have a high-energy way of life. In pursuing it they evolved particular adaptations of their own, notably the ability to dive deep for long periods...

By John W. Kanwisher and Sam H. Ridgway

Georg Cantor and the Origins of Transfinite Set Theory

How large is an infinite set? Cantor demonstrated that there is a hierarchy of infinities, each one "Larger" than the preceding one. His set theory is one of the cornerstones of mathematics...

By Joseph W. Dauben

The Slide Fastener

Otherwise known as the zipper, it took hold, so to speak, some 60 years ago. It is the creation of a host ofinventors going back to Elias Howe of the sewing machine, and the end is not in sight...

By Lewis Weiner


  • 50 and 100 Years Ago - June 1, 1983

  • Science and the Citizen, June 1983

  • Letters

    Letters to the Editors, June 1983

  • Recommended

    Books, June 1983

  • Amateur Scientist

    The Amateur Scientist, June 1983

  • Departments

    The Authors, June 1983

  • Metamagical Themas, June 1983

  • Bibliography, June 1983

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