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Fire and Fire Protection

Fire losses in the U.S. are the highest in the world. The reason is apparently the nation's high standard of living. Better protection calls basically for a better understanding of the mechanism of fire

By Howard W. Emmons

The Sex-Attractant Receptor of Moths

The sex attractant of the female silk moth is detected by an array of receptors on the feathery antennae of the male. A nerve impulse in a receptor cell can be triggered by one molecule of attractant

By Dietrich Schneider

Hybrid Cells and Human Genes

The mapping of human genes and the study of how they are regulated is facilitated by an experimental substitute for sexual breeding: the fusion of human somatic cells with the cells of other mammals

By Frank H. Ruddle and Raju S. Kucherlapati

Unified Theories of Elementary-Particle Interaction

Physicists now invoke four distinct kinds of interaction, or force, to describe physical phenomena. According to a new theory, two, and perhaps three, of the forces are seen to have an underlying identity

By Steven Weinberg

The Glory

This halo of prismatic colors is most often seen around the shadow of an airplane on a cloud. Its cause is not the same as that of the common rainbow, and involves phenomena at the frontier of physics

By Howard C. Bryant and Nelson Jarmie

A Family of Protein-Cutting Proteins

The serine proteases act as catalysts in numerous processes, from the digestion of food to the clotting of blood. They have a common mode of action and apparently evolved from a common ancestor

By Robert M. Stroud

Sources of Ambiguity in the Prints of Maurits C. Escher

The fascinating graphic inventions of the late Dutch artist reflect a strong mathematical and crystallographic influence. Their original inspiration, however, came from experiments on visual perception

By Marianne L. Teuber

The Casts of Fossil Hominid Brains

The skulls of man and his precursors can be used as molds to make replicas of the brain. These casts indicate that man's brain began to differ from that of other primates some three million years ago

By Ralph L. Holloway


  • 50 and 100 Years Ago, July 1974

  • Science and the Citizen, July 1974

  • Letters

    Letters to the Editors, July 1974

  • Recommended

    Books, July 1974

  • Mathematical Recreation

    Mathematical Games, July 1974

  • Amateur Scientist

    The Amateur Scientist, July 1974

  • Departments

    The Authors, July 1974

  • Bibliography, July 1974

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Introducing Scientific American Health & Medicine

Introducing Scientific American Health & Medicine