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The Growth of Core Regions in the Third World

They contain much of the industry and most of the major cities. Since 1950 core regions in developing nations have been gaining population at a rate that poses grave social and economic problems...

By Daniel R. Vining Jr.

The Earth's Hot Spots

These plumes of hot rock welling up from deep in the mantle are a key link in the plate-tectonic cycle. The marks they leave on passing plates include volcanoes, swells and midocean plateaus...

By Gregory E. Vink, W. Jason Morgan and Peter R. Vogt

The Release of Acetylcholine

The compound carries a nerve impulse across a synapse. Recent studies of the electric fish Torpedo suggest that the source of the acetylcholine emitted by a neuron is the cytoplasm rather than the synaptic vesicles...

By Yves Dunant and Maurice Israël

Elementary Particles and Forces

A coherent view of the fundamental constituents of matter and the forces governing them has emerged. It embraces disparate theories, but they may soon be united in one comprehensive description of natural events...

By Chris Quigg

Compartmentalization of Decay in Trees

Animals heal, but trees compartmentalize. They endure a lifetime of injury and infection by setting boundaries that resist the spread of the invading microorganisms

By Alex L. Shigo

The Clouds of Magellan

The nearest neighbors of our galaxy have had a turbulent history. Close encounters with each other and with the Milky Way have split the smaller cloud and drawn out an enormous stream of hydrogen gas...

By Don Mathewson


Rendering the patient insensitive to pain is still an essential part of the anesthesiologist's work; another major function is to maintain the stability of the patient's vital-organ systems...

By Peter M. Winter and John N. Miller

The Parsons Steam Turbine

Invented in 1884 by Charles A. Parsons, son of an aristocrat and scientist, it revolutionized shipping and the generation of electric power. Many of Parsons' innovations are still in use...

By W. Garrett Scaife


  • 50 And 100 Years Ago: April 1985

  • Science And The Citizen, April 1985

  • Letters

    Letters to the Editors, April 1985

  • Recommended

    Books, April 1985

  • Amateur Scientist

    The Amateur Scientist, April 1985

  • Departments

    The Authors, April 1985

  • Computer Recreations, April 1985

  • Bibliography, April 1985

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