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Features

The U.S. Patent System

The patent law both protects inventors and encourages the diffusion of inventions. The present law has not basically changed since 1836, and it is now proposed that new circumstances call for its revision

By J. Herbert Hollomon

The Primeval Fireball

The earth is bathed in radio waves that appear to have originated at the time of the primordial "big bang." This radiation provides the cosmologist with a rare new clue to the nature of the universe

By David T. Wilkinson and P. J. E. Peebles

Teotihuacán

The first and largest city of the pre-Columbian New World arose in the Valley of Mexico during the first millennium A.D. At its height the metropolis covered a larger area than imperial Rome

By Ren Millon

Molecular Isomers in Vision

Certain organic compounds can exist In two or more forms that have the same chemical composition but different molecular architecture. One of them is the basis for vision throughout the animal kingdom

By Allen Kropf and Ruth Hubbard

Liquid Lasers

There are a number of advantages to be gained from using a liquid as the active medium in a laser rather than a solid or a gas. Such devices may soon become competitive with more conventional lasers

By Alexander Lempicki and Harold Samelson

Geological Subsidence

In many parts of the world the pumping of oil, gas or water out of the ground has caused the land to sink. Where oil or gas are involved the subsidence can be forestalled by pumping in water

By Stanley N. Davis and Sullivan S. Marsden

Butterflies and Plants

The hungry larvae of butterflies are selective in choosing the plants they eat. This reflects the fact that the evolution of both plants and the animals that feed on them is a counterpoint of attack and defense

By Paul R. Ehrlich and Peter H. Raven

Memory and Protein Synthesis

If a goldfish is trained to perform a simple task and shortly thereafter a substance that blocks the manufacture of protein is injected into its skull, it forgets what it has been taught

By Bernard W. Agranoff

Departments

  • 50 and 100 Years Ago: June 1967

  • Science and the Citizen: June 1967

  • Letters

    Letters to the Editors, June 1967

  • Recommended

    Books

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Bibliography

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June 1967