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Features

The Geography of U.S. Presidential Elections

Enduring geographic cleavages divide the electorate. They weigh heavily in the Electoral College system and demand that a winning candidate build a geographic coalition

By Ellen R. White, Fred M. Shelley, J. Clark Archer and Peter J. Taylor

Gravitational Lenses

These cosmic flukes offer a unique window on the secrets of the universe. Systematic searches now under way are designed to realize the scientific promise of the objects

By Edwin L. Turner

Hormones that Stimulate the Growth of Blood Cells

Each hemopoietin regulates the production of a specific set of blood cells. Now made by recombinant-DNA methods, these hormones promise to transform the practice of medicine

By David W. Golde and Judith C. Gasson

The Supercontinent Cycle

Several times in earth history the continents have joined to form one body, which later broke apart. The process seems to be cyclic; it may shape geology and climate and thereby influence biological evolution...

By Judith B. Moody, R. Damian Nance and Thomas R. Worsley

Randomness in Arithmetic

It is impossible to prove whether each member of a family of algebraic equations has a finite or an infinite number of solutions: the answers vary randomly and therefore elude mathematical reasoning...

By Gregory J. Chaitin

Capacitors

They are the electronic guardians of integrated circuits. Innovative manufacturing, materials and design have enabled a 200-year-old device to keep pace with silicon technology

By Donald M. Trotter

How the Human Eye Focuses

As people age, their ability to focus on nearby objects gradually declines. Several probable causes have been identified, including changes in the eye's geometry and biochemistry

By George H. Handelman and Jane F. Koretz

The Chaco Canyon Community

This ancient Anasazi site contains the ruins of nine multistory dwellings connected to the outside world by an elaborate system of roads. Why were they built and who lived in them?

By John R. Stein, Stephen H. Lekson, Thomas C. Windes and W. James Judge

Departments

  • 50 and 100 Years Ago: July 1988

  • Snakebit

  • Ill-starred

  • Getting Warmer?

  • Sons of STM

  • Rotor Rooters

  • Upfreezing

  • Odd Couple

  • Superduds

  • Language of Translation

  • Skin Saver

  • Genetic Skeleton

  • In Vino Scientia

  • Benevolent Bradykinins

  • Groupware

  • Messages from on High

  • Keeping Cool

  • Laughing Matters

  • Letters

    Letters to the Editors, July 1988

  • Recommended

    Books, July 1988

  • Amateur Scientist

    The Amateur Scientist, July 1988

  • Departments

    Computer Recreations, July 1988

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