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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

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

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

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

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

Microcomputers

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

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

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

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