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An Experiment in Work Satisfaction

Boredom on the assembly line, reflected in high labor turnover and absenteeism, has stimulated efforts to find new ways of organizing work. The author describes one such experiment in a Swedish plant...

By Lars E. Bjrk

X-Ray-Emitting Double Stars

An analysis of certain very powerful X-ray sources suggests that the radiation emanates from a binary system where a superdense collapsed star is orbiting closely around a massive normal star...

By Edward P. J. van den Heuvel and Herbert Gursky

Interactive Human Communication

Studies of how people communicate in solving problems assist progress toward the development of a conversational computer, with which the user could communicate as if it were a person

By Alphonse Chapanis

The Earth's Mantle

This great body of hot rock accounts for 83 percent of the volume of the earth and 67 percent of its mass. Although the mantle is inaccessible, much has been learned about it by indirect evidence...

By Peter J. Wyllie

Visual Pigments and Color Blindness

Color Vision depends on three types of cone cell, each containing one of three visual pigments. Those who are color-blind either lack one of the pigments or have an anomalous pigment in one type of cone...

By W. A. H. Rushton

The Role of Wax in Oceanic Food Chains

Copepods, ubiquitous marine crustaceans, store energy in the form of wax. It now seems that half of the organic nlatter synthesized by the sea's primary producers is conrerted for a time into waxes...

By Richard F. Lee and Andrew A. Benson

The Most Poisonous Mushrooms

Certain fungi of the genus Amanita contain toxins of extraordinary virulence. They are ring-shaped molecules made up of amino acids, and they disrupt the membranes and the nuclei of cells in the liver...

By Walter Litten

Galileo's Discovery of the Parabolic Trajectory

He showed that a body falling with a horizontal component of motion describes a parabola. It has been thought that he did so solely by principle, but it now appears that he conducted careful experiments...

By Stillman Drake and James MacLachlan


  • 50 and 100 Years Ago, March 1975

  • Science and the Citizen, March 1975

  • Letters

    Letters to the Editors, March 1975

  • Reviews

    Books, March 1975

  • Mathematical Recreation

    Mathematical Games, March 1975

  • Amateur Scientist

    The Amateur Scientist, March 1975

  • Departments

    The Authors, March 1975

  • Bibliography, March 1975

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