The Social Power of the Negro
How is it that immigrants such as the Irish and the Italians have been able to evolve group power in the U.S., whereas Negroes have not? The principal reason is an unrecognized disunity among Negroes...
Features
The Induction of Cancer by Viruses
Normal cells cultured in glassware can be transformed into cancer cells by several viruses. Such "model" systems are studied to find how the virus, with fewer than 10 genes, can produce the change...
The Changing Helicopter
The unique capabilities of this improbable flying machine make it adaptable to many purposes. Because of recent improvements future models will have more speed, maneuverability and carrying capacity...
The Antiquity of Human Walking
Man's unique striding gait may be the most significant ability that sets him apart from his ancestors. A big-toe bone found in Tanzania is evidence that this ability dates back more than a million years...
Neutron-Activation Analysis
This powerful analytic tool is now routinely used in a wide range of disciplines to measure the concentrations of trace elements, often in amounts less than a billionth of a gram
Rivers in the Making
In various parts of the world water drains from the land not in distinct streams and rivers but in strangely interlaced channels. It seems that such drainage is a stage in the evolution of rivers...
The Evolution of Bee Language
Different species of bees communicate In different ways. When primitive bees are compared with more advanced ones, it seems that communication by sound preceded communication by dancing
Antimatter and Cosmology
Experiments in high-energy physics have demonstrated the complete symmetry between particles and antiparticles. A novel theory of the universe that takes this basic symmetry into account is advocated...
Departments
50 and 100 Years Ago: April 1967
Science and the Citizen: April 1967
- Letters
Letters to the Editors, April 1967
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
