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On the Generalized Theory of Gravitation

An account of the newly published extension of the general theory of relativity against its historical and philosophical background

By Albert Einstein

The Hydrogen Bomb: II

In which the technical and strategic discussion of last issue is continued, and a proposal is made for a first step toward the international control of atomic weapons

By Hans A. Bethe

The Metamorphosis of Insects

The phenomenon has long fascinated naturalists; now it sheds light on the forces that regulate growth and direct the specialization of cells

By Carroll M. Williams

The Synthetic Elements

There are nine of them, including the newly manufactured berkelium. Four have filled gaps in the periodic table of 92 elements and five have extended it beyond uranium

By I. Perlman and G. T. Seaborg

The Changing Climate

There is little doubt that the averages of conditions which make up the weather have changed during the course of history. What about man's efforts to alter them further?

By George H. T. Kimble

“Social Instincts”

It is too often assumed that the law of nature is: kill or be killed. Presenting an argument for the opposite principle: a natural law of cooperation

By Ashley Montagu

The Probability of Death

It varies considerably with age and species. Man, however, has manipulated his curve of survival so it rather resembles that of the starved fruit fly

By Edward S. Deevey Jr.


  • 50 and 100 Years Ago: April 1950

  • Science and the Citizen: April 1950

  • Letters

    Letters to the Editos, April 1950

  • Recommended


  • Amateur Scientist

    The Amateur Astronomer

  • Departments


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