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A Revolution in Electronics

The transistor, a superior new means of controlling the flow of electrons, has now been developed in a practical form; it liberates electronics from the limitations of the vacuum tube

By Louis N. Ridenour

The Lost Cities of Peru

How aerial photography and the jeep combined to give an overall view of the many cultures that flourished on the north Peruvian coast before the Inca conquest

By Richard P. Schaedel

The Deep-Sea Layer of Life

Hundreds of fathoms down in the oceans is a drifting mass that once was called the "false bottom" but now is believed to consist of organisms, identity unknown

By Lionel A. Walford

Hybrid Corn

Vigorous new crosses of the ancient cultivated plant have revolutionized the agriculture of the Corn Belt. An account of their development and its consequences

By Paul C. Mangelsdorf

Heart Muscle

Structure underlying function is shown by electron micrographs

Experiments in Perception

Some remarkable optical illusions show that what we perceive does not directly correspond to reality; it is a subtle blend of the external world and the many lessons of our experience

By W. H. Ittelson and F. P. Kilpatrick

Sickle-Cell Anemia

A hereditary disease in which some of the red blood cells are shaped like crescents instead of disks has been traced to a defect in the molecule of hemoglobin

By George W. Gray

A Machine that Learns

Concerning Machina docilis, descendant of Machina speculatrix, the small imitation of life that was described in the May, 1950, issue of this magazine

By W. Grey Walter


  • 50 and 100 Years Ago: August 1951

  • Science and the Citizen: August 1951

  • Letters

    Letters to the Editors, August 1951

  • Recommended


  • Departments

    The Amateur Astronomer

  • Bibliography

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