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Features

Genetic Amniocentesis

The fluid that surrounds a fetus in the uterus can now be examined for the prenatal detection of genetic disorders, yet the procedure is being performed for only a tenth of the parents most in need of it

By Fritz Fuchs

Computer Backgammon

Backgammon is a good test of principles of artificial intelligence. BKG 9.8 is the first computer program to defeat a world champion at any board or card game

By Hans Berliner

The Functioning of Blood Platelets

These small bodies act to stop the Row of blood from a wound. The interactions of their contents with substances in the blood plasma and in tissue play complex roles in health and disease

By Marjorie B. Zucker

Gauge Theories of the Forces between Elementary Particles

All the basic forces of nature are now described by theories of this kind. The properties of the forces are deduced from symmetries or regularities apparent in the laws of physics

By Gerard't Hooft

Ice-Age Subsistence in Northern Spain

A 12,000-year record of man's quest for food in Pleistocene times has been found in a cave near the Bay of Biscay. Changes in the use of resources suggest a response to increasing demographic pressure

By Geoffrey A. Clark, Jesus A. Ortea, Jesus Altuna and Lawrence Guy Straus

The Deep-Earth-Gas Hypothesis

There is much evidence indicating that earthquakes release gases from deep in the earth's mantle. Such gases may include methane of nonbiological origin, which could be a vast resource of fuel

By Steven Soter and Thomas Gold

Sexual Selection in the Black-tipped Hangingfly

This species has evolved a striking form of mating behavior: females choose males on the basis of the prey they present during courtship,and males may mimic female behavior to steal such prey hom rivals

By Randy Thornhill

Departments

  • 50 and 100 Years Ago, June 1980

  • Basaltic Meteorites

  • Science and the Citizen, June 1980

  • Letters

    Letters to the Editors, June 1980

  • Recommended

    Books, June 1980

  • Mathematical Recreation

    Mathematical Games, June 1980

  • Amateur Scientist

    The Amateur Scientist, June 1980

  • Departments

    The Authors, June 1980

  • Bibliography, June 1980

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