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Earthquake Prediction

Recent technical advances have brought this long-sought goal within reach. With adequate funding several countries, including the U.S., could achieve reliable long-term and short-term forecasts in a decade...

By Frank Press

The Molecular Biology of Poliovirus

The agent of a once dreaded disease has become a tame laboratory organism, an excellent instrument for studying the multiplication of a virus and the cellular machinery it converts to that purpose...

By David Baltimore and Deborah H. Spector


Evolutionary successor of the minicomputer, the microcomputer is a set of microelectronic "chips" serving the various computer functions. It has opened up new realms of computer applications...

By Andr G. Vacroux

Randomness and Mathematical Proof

Although randomness can be precisely defined and can even be measured, a given number cannot be proved to be random. This enigma establishes a limit to what is possible in mathematics

By Gregory J. Chaitin

The Social System of Lions

The organization of the social unit of lions, the pride, and the behavior of the anilnals in it are a sensitive reflection of the lion's adaptation to its enviroment

By Brian C. R. Bertram

Rural Market Networks

They form geometrical patterns that provide a basis for close analysis. Two recent investigations bring out the critical role of such systems in contrasting countries: China and Guatemala...

By Stuart Plattner

The Search for Extraterrestrial Intelligence

There can be little doubt that civilizations more advanced than the earth's exist elsewhere in the universe. The probabilities involved in locating one of them call for a substantial effort...

By Carl Sagan and Frank Drake

Forest Succession

The study of a woods in New Jersey has yielded a predictive model for the succession of trees in a mixed forest. Two basic factors are the moisture in the soil and the geometry of leaf arrangement...

By Henry S. Horn


  • 50 and 100 Years Ago, May 1975

  • Science and the Citizen, May 1975

  • Letters

    Letters to the Editors, May 1975

  • Recommended

    Books, May 1975

  • Mathematical Recreation

    Mathematical Games, May 1975

  • Amateur Scientist

    The Amateur Scientist, May 1975

  • Departments

    The Authors, May 1975

  • Bibliography, May 1975

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