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The Prompt and Delayed Effects of Nuclear War

The prompt effects of nuclear weapons are the basis for the size of U.S. strategic forces. The delayed effects are equally great, ensuring that these forces remain a more than ample deterrent...

By Kevin N. Lewis

The Epstein-Barr Virus

It is perhaps the commonest of all the viruses that infect human beings. It is the cause of infectious mononucleosis, and there is substantial evidence linking it with two types of human cancer...

By Warner Henle, Gertrude Henle and Evelyne T. Lennette

The Central Parsec of the Galaxy

Infrared and radio observations indicate that the center of our galaxy harbors an ultracompact object, possibly a massive black hole, embedded in a dense, swirling mass of stars, gas and dust...

By Thomas R. Geballe

The Origins of the First Powered, Man-Carrying Airplane

The Wright brothers' "Flyer" of 1903 was not just a lucky effort by two bicycle mechanics from Dayton but the outcome of an intensive program of research, engineering and testing

By F. E. C. Culick

Compartments in Animal Development

Flies, and maybe other animals too, seem to be composed of a number of compartments: homologous units within which key genes execute decisions committing several clones of cells to a line of development...

By Antonio Garca-Bellido, Gines Morata and Peter A. Lawrence

The Bag Model of Quark Confinement

Quarks appear to be real, and yet they have not been observed in isolation. One hypothesis for why they have not been is that they are confined in bags analogous to the bubbles in a liquid...

By Kenneth A. Johnson

The Animals of the Burgess Shale

The fossils of a rock formation in western Canada are a rich sample of an animal community in the mid-Cambrian: Some of the animals are ancestors of those living today; others are unique and bizarre...

By Simon Conway Morris and H. B. Whittington

The Visual Perception of Motion in Depth

It now appears that information concerning motion in depth is processed in two distinct channels, which converge on a single motion-in-depth stage of the human visual perception system

By David Regan, Kenneth Beverley and Max Cynader


  • 50 and 100 Years Ago, July 1979

  • Letters

    Letters to the Editors, July 1979

  • Recommended

    Books, July 1979

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist, July 1979

  • Science and the Citizen

    Science and the Citizen, July 1979

  • Departments

    The Authors, July 1979

  • Bibliography, July 1979

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