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Experience in a few countries where induced abortion is legal is now beginning to provide the first reliable data on this age-old, most widely used and most clandestine method of fertility control...

By Christopher Tietze and Sarah Lewit

Seyfert Galaxies

They superficially resemble normal spiral galaxies, but something violent is going on in their central regions. They seem to have much in common with the most powerful radio sources known, the quasars...

By Ray J. Weymann

Cellular Factors in Genetic Transformation

In transformation certain bacteria change their hereditary makeup by absorbing DNA molecules from their environment. The ability to do this is induced by a giant-molecule factor synthesized by the cell...

By Alexander Tomasz

Weather Satellites: II

In the seven years since they were first described in these pages they have made major contributions to meteorology. Now a satellite system surveys each day the weather patterns over the entire earth...

By Arthur W. Johnson

The Neurophysiology of Remembering

Experiments with monkeys have identified the brain areas involved in the recall of various learned tasks. Memory may take the form of interference patterns that resemble laser-produced holograms...

By Karl H. Pribram

The Eland and the Oryx

These large African antelopes can survive indefinitely without drinking. Their feat is made possible by stratagems of physiology that minimize the amount of water they lose through evaporation...

By C. R. Taylor

The Control of Vibration and Noise

The addition of constrained-layer damping to the conventional techniques of isolation and absorption provides the necessary technology to control almost all excessive vibration and noise...

By Theodore P. Yin

Life on the Human Skin

The skin is an ecosystem, with a microscopic flora and fauna and diverse ecological niches: the desert of the forearm, the cool woods of the scalp and the tropical forest of the armpit

By Mary J. Marples

The Dance of the Solids

By John Updike


  • 50 and 100 Years Ago: January 1969

  • Science and the Citizen: January 1969

  • Letters

    Letters to the Editors, January 1969

  • Recommended


  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Bibliography

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