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Steel Minimills

At a time in the U.s. when some large steel plants that start with iron ore are being shut down, smaller plants that start with scrap steel and market a limited line of products locally are doing well...

By Jack Robert Miller

Oceanic Fracture Zones

They complicate the pattern discerned in the theory of plate tectonics by dissecting the edges of the plates that compose the ocean floor. Some of them are the width of an ocean basin

By Kathleen Crane and Enrico Bonatti

How Receptors Bring Proteins and Particles into Cells

Receptor-mediated endocytosis is a process whereby cells can take up specific large molecules. In most cases a receptor, having delivered its ligand, is recycled to the plasma membrane to bind more ligand...

By Alice Dautry-Varsat and Harvey F. Lodish

Turing Machines

At its logical base every digital computer embodies one of these pencil-and-paper devices invented by the British mathematician A. M. Turing. The machines mark off the limits of computability...

By John E. Hopcroft

Parasites that Change the Behavior of their Host

In doing so they make the host more vulnerable to predation by their next host. Among such parasites are certain thorny-headed worms, which infest pill bugs that are later eaten by songbirds...

By Janice Moore

The Inflationary Universe

A new theory of cosmology suggests that the observable universe is embedded in a much larger region of space that had an extraordinary growth spurt a fraction of a second after the primordial big bang...

By Alan H. Guth and Paul J. Steinhardt

An Indian Hunters' Camp for 20,000 Years

A rock shelter in western Pennsylvania was periodically occupied from about 19,000 B.C. to A.D. 1000. The extreme age of the site bears on the question of when men entered the Western Hemisphere...

By J. M. Adovasio and R. C. Carlisle

Island Epidemics

Epidemics are patterns in time and space that can best be perceived when they are studied in a small, isolated population. An example is provided by a study of a century of measles epidemics in Iceland...

By Andrew Cliff and Peter Haggett


  • 50 and 100 Years Ago: May 1984

  • Science and the Citizen, May 1984

  • Letters

    Letters to the Editors, May 1984

  • Recommended

    Books, May 1984

  • Amateur Scientist

    The Amateur Scientist, May 1984

  • Departments

    The Authors, May 1984

  • Computer Recreations, May 1984

  • Bibliography, May 1984

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