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Features

Electromagnetic Flight

The future of high-speed ground transportation way well lie not with wheeled trains but with vehicles that "fly" a foot or so above a guideway, lifted and propelled by electromagnetic forces

By Henry H. Kolm and Richard D. Thornton

Herpes Viruses and Cancer

It has been known for some time that these ubiquitous viruses can cause cancer in experimental anilnals. There is now much evidence that a virus of this type is also implicated in some cancers of man

By Keen A. Rafferty Jr.

The Sling as a Weapon

This manual missile launcher is not as well known as the archer's bow, yet it was used by lightly armed troops from India and Persia to Greece and Rome and even survived the advent of gunpowder

By Manfred Korfmann

Protein Shape and Biological Control

The processes of life are turned on and off by means of a universal control mechanism that depends on the ability of protein molecules to bend flexibly from one shape to another under external influences

By Daniel E. Koshland Jr.

The Solar Corona

The physical nature of the sun's outer atmosphere is emerging from observations made not only on the ground during eclipses but also from rockets, from satellites and even from the moon

By Jay M. Pasachoff

High-Efficiency Photosynthesis

Certain plants of hot and arid environments have evolved an unusual photosynthetic pathway with a high yield. This efficiency could well be turned to agricultural advantage

By Olle Björkman and Joseph Berry

Auditory Beats in the Brain

Slow modulations called binaural beats are perceived when tones of different frequency are presented separately to each ear. The sensation may show how certain sounds are processed by the brain

By Gerald Oster

Electron-Positron Collisions

When the electron and its antiparticle collide, they can annihilate each other and give rise to radiation or other particles. Such processes are currently studied with opposed beams of electrons and positrons

By Alan M. Litke and Richard Wilson

Departments

  • 50 and 100 Years Ago, October 1973

  • Science and the Citizen, October 1973

  • Letters

    Letters to the Editors, October 1973

  • Recommended

    Books, October 1973

  • Mathematical Recreation

    Mathematical Games, October 1973

  • Amateur Scientist

    The Amateur Scientist, October 1973

  • Departments

    The Authors, October 1973

  • Bibliography, October 1973

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