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Can the U.S. Trust the U.S.S.R.?

Neither country is beyond reproach in its observance of the SALT arms-control treaties. Soviet behavior can be understood in the broader context of superpower political and military competition...

By Miroslav Nincic

The Dynamics of Proteins

The molecules essential to life are never at rest; they would be unable to function if they were rigid. The internal motions that underlie their workings are best explored in computer simulations...

By Martin Karplus and J. Andrew McCammon

The Quantized Hall Effect

This variation on a classical phenomenon makes it possible, even in an irregular sample, to measure fundamental constants with an accuracy rivaling that of the most precise measurements yet made...

By Bertrand I. Halperin

Islamic Astronomy

While astronomy withered in medieval Europe it flourished in Islam. Renaissance astronomers learned from the texts of Islamic scholars who had preserved and transformed the science of the ancient Greeks...

By Owen Gingerich

Internal Rhythms in Bird Migration

Migratory birds have a clock that tells them when to begin and end their flight. It is based on rhythms with a period of about a year. Remarkably, the clock also helps the birds to find their destinations...

By Eberhard Gwinner

Optical Gyroscopes

They can detect rotational motion just as mechanical gyroscopes can, but they contain virtually no moving parts. The instruments have already established an important place in guidance systems...

By Dana Z. Anderson

The "Stress" of Being Born

The stress of journeying through the birth canal is not harmful to most infants. In fact, the surge of "stress" hormones it triggers can be important to the neonate's survival outside the womb...

By Theodore A. Slotkin and Hugo Lagercrantz

Playing the Baroque Trumpet

Research into the history and physics of this largely forgotten instrument is revealing its secrets, enabling modern trumpeters to play it as the musicians of the 17th and 18th centuries did...

By Don Smithers, Klaus Wogram and John Bowsher


  • 50 And 100 Years Ago: April 1986

  • Science And The Citizen, April 1986

  • Letters

    Letters to the Editors, April 1986

  • Amateur Scientist

    The Amateur Scientist, April 1986

  • Departments

    The Authors, April 1986

  • Computer Recreations, April 1986

  • Books, April 1986

  • Bibliography, April 1986

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