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The Origins of New World Civilization

In the Mexican valley of Tehuacn bands of hunters became urban craftsmen In the course of 12,000 years. Their achievement raises some new questions about the evolution of high cultures in general

By Richard S. MacNeish

Exploding Galaxies

Evidence of a titanic explosion in the nucleus of a nearby radio galaxy suggests that such events may be responsible for a large part of the cosmic radiation striking the earth

By Allan R. Sandage

The Reproductive Behavior of Ring Doves

An account of experiments showing that the changes in activity that constitute the behavior cycle are governed by interactions of outside stimuli, the hormones and the behavior of each mate

By Daniel S. Lehrman

The Solid State of Polyethylene

The chainlike molecules of polyethylene have the cunous ability to disentangle themselves and form crystals. The study of nearly perfect crystals can suggest ways to improve all linear polymers

By Bernhard Wunderlich

Lateritic Soils

Rich in minerals and poor in organic matter, these soils are common in the Tropics. They present an obstacle to increasing the production of food in many of the underdeveloped nations

By Mary McNeil

The Michelson-Morley Experiment

Performed in Cleveland in 1887, this famous experiment disproved the hypothesis of a stationary "luminiferous ether." The problems it posed led indirectly to Einstein's special theory of relativity

By R. S. Shankland

Psychological Time

Everyone knows that his subjective sense of the passage of time can be influenced by circumstances. How much various circumstances affect this sense is explored by experiment

By John Cohen

Departments

  • 50 and 100 Years Ago: November 1964

  • Science and the Citizen: November 1964

  • The Hemoglobin Molecule

  • Letters

    Letters to the Editors, November 1964

  • Recommended

    Books

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Bibliography

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November 1964

Reanimate Your Brain

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