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Features

Thermal Pollution and Aquatic Life

The increasing use of river and lake waters for industrial cooling presents a real threat to fish and other organisms. To avoid an ecological crisis new ways must be found to get rid of waste heat

By John R. Clark

Superplastic Metals

A new approach to the processing of metals makes it possible to form them by methods usually reserved for glass and plastics. This processing gives the metals a distinctive microstructure

By H. W. Hayden, J. H. Brophy and R. C. Gibson

Phases in Cell Differentiation

By cultivating embryonic tissue in the laboratory one can study the specialization of cells in the mammalian pancreas. There seem to be three regulatory phases, each leading to a new stage of differentiation

By Norman K. Wessells and William J. Rutter

Continental Drift and Evolution

The breakup of ancient supercontinents would have had major effects on the evolution of living organisms. Does it explain the difference in the diversification of reptiles and mammals?

By Bjrn Kurtn

Brownian Motion and Potential Theory

The discovery that these two apparently unrelated branches of physics are in some sense mathematically equivalent has led to a new subject known as probabilistic potential theory

By Reuben Hersh and Richard J. Griego

The Atmospheres of Mars and Venus

Distance from the sun can only partly explain why the atmospheres of these two planets are so different. If life had not appeared on the earth, its atmosphere might resemble that of one or the other

By Von R. Eshleman

Plague Toxin

The bacillus that caused the "Black Death" manufactures a protein that is lethal to some animals and harmless to others. How does this substance exert its effect on the molecular machinery of the cell?

By Solomon Kadis, Thomas C. Montie and Samuel J. Ajl

The First Electron Tube

In 1904 John Ambrose Fleming wrote Guglielmo Marconi: "I have been receiving signals on an aerial with nothing but a mirror galvanometer and my device." The device was the original thermionic vacuum diode

By George Shiers

Departments

  • 50 and 100 Years Ago: March 1969

  • Science and the Citizen: March 1969

  • Letters

    Letters to the Editors, March 1969

  • Recommended

    Books

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Bibliography

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March 1969

Think Outside the Gift Box