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Features

A Nuclear-Weapon-Free Zone in Europe

A proposal to ban nuclear weapons of all kinds from a strip of land on both sides of the East- West boundary in central Europe is viewed as a politically feasible approach to reducing the risk of nuclear war

By Mark R. Moore and Barry M. Blechman

Silicon Micromechanical Devices

Tiny valves, nozzles, pressure sensors and other mechanical systems can be chemically etched in a wafer of single-crystal silicon. Such devices can be mass-produced much as microelectronic circuits are

By James B. Angell, Stephen C. Terry and Phillip W. Barth

The Structure of Quarks and Leptons

They have been considered the elementary particles of matter, but instead they may consist of still smaller entities confined within a volume less than a thousandth the size of a proton

By Haim Harari

Hot Springs on the Ocean Floor

A sign of the volcanic activity that mints new oceanic crust, they nourish strange forms of life and lay down great deposits of ore. They also help to explain the chemical content of the sea

By Karen Von Damm and John M. Edmond

A Window on the Sleeping Brain

REM (rapid eye movement) sleep, the phase of sleep when vivid dreams occur, is normally accompanied by paralysis. The paralysis can now be turned off in animals, making it possible to explore the REM phase

By Adrian R. Morrison

Early Farmers of the North European Plain

Excavations in Poland have revealed the remains of the people who farmed, herded and hunted in the area some 7,000 years ago. It was a time of transition, but in the end agriculture had come to stay

By Ryszard Grygiel and Peter Bogucki

Chemical Signals of Social Amoebae

Two cellular slime molds can coexist in the same sail and yet maintain their identity. They do so by emitting and responding to different chemicals, both of which have now been identified

By John Tyler Bonner

Intuitive Physics

Although Newton's laws are well known, tests show many people believe moving objects behave otherwise. The subjects of the tests tend to follow a theory held in the three centuries before Newton

By Michael McCloskey

Departments

  • 50 And 100 Years Ago: April 1983

  • Science And The Citizen, April 1983

  • Letters

    Letters to the Editors, April 1983

  • Recommended

    Books, April 1983

  • Amateur Scientist

    The Amateur Scientist, April 1983

  • Departments

    The Authors, April 1983

  • Metamagical Themas, April 1983

  • Bibliography, April 1983

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April 1983

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