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Values and Attitudes of the Polish People

Recent events in Poland, illuminated by 25 years of social research, are shown to stem not from a change in values but from a demand for social institutions more in accord with values consistently held

By Stefan Nowak

The Salinity of Rivers

Rivers normally wash into the ocean the salts dissolved out of rock. When the flow is held up by irrigation, however, evapotranspiration concentrates the salt in the soil, creating problems for agriculture

By Arthur F. Pillsbury

Genetic Engineering in Mammalian Cells

One goal of recombinant-DNA technology iS the cure of human genetic diseases. As a step toward the goal a hereditary defect is corrected by microinjecting a single gene into a mammalian cell

By Elaine G. Diacumakos and W. French Anderson

Fiber Bundles and Quantum Theory

A branch of mathematics that extends the notion of curvature to topological analogues ofa Mobius strip can help to explain prevailing theories of the interactions of elementary particles

By Anthony V. Phillips and Herbert J. Bernstein

Mimicry in the Sexual Signals of Fireflies

Male fireflies flash as they fly seeking mates at night, and females of the same species flash answers hom the ground. Females of other species also answer and devour any males they can lure within reach

By James E. Lloyd

The Architecture of Christopher Wren

He was a prominent man of science and a renowned architect at the height of the Scientific Revolution, but he did not exploit principles of theoretical mechanics in designing his buildings

By Harold Dorn and Robert Mark


  • 50 and 100 Years Ago: July 1981

  • The Atmosphere of Venus

  • Science and the Citizen, July 1981

  • Binocular Depth Inversion

  • Letters

    Letters to the Editors, July 1981

  • Recommended

    Books, July 1981

  • Amateur Scientist

    The Amateur Scientist, July 1981

  • Departments

    The Authors, July 1981

  • Metamagical Themas, July 1981

  • Bibliography, July 1981

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July 1981