Scientific American Magazine Vol 220 Issue 3

Scientific American Magazine

Volume 220, Issue 3

You are currently logged out. Please sign in to download the issue PDF.

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

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

H. W. Hayden, J. H. Brophy, 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

Norman K. Wessells, 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?

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

Reuben Hersh, 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

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?

Solomon Kadis, Thomas C. Montie, 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

George Shiers

Departments

Letters to the Editors, March 1969

50 and 100 Years Ago: March 1969

The Authors

Science and the Citizen: March 1969

Mathematical Games

The Amateur Scientist

Books

Bibliography