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Features

Male Fertility

Perhaps two thirds of the cases of human infertility are chargeable to men rather than women. Some recent studies have revealed a few interesting reasons why

By Edmond J. Farris

High Vacuum

The void of the ancient Greek philosophers has become the essential medium of subtle processes in modern science and technology

By Philip and Emily Morrison

The Crust of the Earth

The traditional view of the architecture of continents and ocean floors is in process of being revised by some resourceful new methods of probing beneath the surface

By Walter H. Bucher

An Imitation of Life

Concerning the author's instructive genus of mechanical tortoises. Although they possess only two sensory organs and two electronic nerve cells, they exhibit "free will"

By W. Grey Walter

Frog Calls

The musical patterns produced by various species on a summer night are made visible in traces produced by the sound spectrograph

By Ralph K. Potter

Aristotle's Physics

The famed Greek philosopher is recognized as one of the great early zoologists. But what about his reputation as a physicist?

By Carl B. Boyer

Volvox: A Colony of Cells

The microscopic green globe that dwells in ponds is a significant member of the evolutionary line between the one-celled and many-celled organisms

By John Tyler Bonner

Departments

  • 50 and 100 Years Ago: May 1950

  • The Hydrogen Bomb: III

  • Science and the Citizen: May 1950

  • Letters

    Letters to the Editors, May 1950

  • Recommended

    Books

  • Amateur Scientist

    The Amateur Astronomer

  • Departments

    Bibliography

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May 1950

Think Outside the Gift Box