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Mirror writing and similar problems are usually blamed on defects in visual perception, but in truth dyslexia seems to be a complex linguistic deficiency. The remedy is proper instruction in reading...

By Frank R. Vellutino

The Structure of Poliovirus

The virus renowned for its devastating effects has become a model for in vestigating the molecular links between form and function. Analysis of its structure will enlarge the scope of viral research...

By David J. Filman, James M. Hogle and Marie Chow

Cooling and Trapping Atoms

Atoms are slowed and cooled by radiation pressure from laser light and then trapped in a bottle whose walls are magnetic fields. Cooled atoms are ideal for exploring basic questions of physics...

By Harold J. Metcalf and William D. Phillips


This practice, which entails growing the same crop on the same land repeatedly, has certain advantages for farmers but may not always be good agronomy.

By R. F. Follett and J. F. Power

Optical Neural Computers

Can computers be built to solve problems, such as recognizing patterns, that entail memorizing all possible solutions? The key may be to arrange optical elements in the same way as neurons are arranged in the brain...

By Demetri Psaltis and Yaser S. Abu-Mostafa

The Rifting of Continents

It begins above a hot zone in the mantle. Upwelling molten rock underplates and weakens the continental crust, piercing it at discrete points and finally "rifting" it in two: an ocean is born...

By Enrico Bonatti

Thermoregulation in Winter Moths

Curiously lacking in highly specialized adaptations for the cold, certain nondescript moth species can nevertheless do what their relatives cannot: fly, feed and mate at near-fi-eezing temperatures...

By Bernd Heinrich

A Mesolithic Camp in Denmark

On a small rise that was once an island an unusual excavation has yielded clues to the rich foraging culture that flourished on the coasts of northern Europe during the Middle Stone Age...

By Erik Brinch Petersen and T. Douglas Price


  • 50 and 100 Years Ago: March 1987

  • Science and the Citizen, March 1987

  • Letters

    Letters to the Editors, March 1987

  • Recommended

    Books, March 1987

  • Amateur Scientist

    The Amateur Scientist, March 1987

  • Departments

    The Authors, March 1987

  • Computer Recreations, March 1987

  • Bibliography, March 1987

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