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Genetic Dissection of Behavior

By working with fruit flies that are mosaics of normal and mutant parts it is possible to identify the genetic components of behavior, retrace their development and locate the sites where they operate

By Seymour Benzer

Violent Tides between Galaxies

The peculiar forms of certain galaxies could be a result of tidal distortions. This theory, out of favor for a decade, seems to be confirmed by experiments with computer models of galaxies

By Alar and Juri Toomre

The Tropical Rain Forest

One of the oldest ecosystems and a reservoir of genetic diversity, the wet evergreen tropical forest is threatened by the activities of man and may virtually disappear by tbe end of the 20th century

By Paul W. Richards

Laser Spectroscopy

The introduction of the laser as a spectroscopic tool has made it possible to produce extremely narrow "resonances" in the optical emission and absorption spectra of gases

By V. S. Letokhov and M. S. Feld

Copernicus and Tycho

In which the author, exploring who read Copernicus' book at the time of its appearance, discovers Tycho's personal copy of it. Tycho's notes show how he evolved his non-Copernican model of the solar system

By Owen Gingerich

The Soaring Flight of Vultures

The six common vultures of East Africa can make a round trip of as much as 200 kilometers by skillfully riding updrafts. How they do so is examined with the aid of a powered glider

By C. J. Pennycuick


  • 50 and 100 Years Ago, December 1973

  • Flywheels

  • Science and the Citizen, December 1973

  • Slips of the Tongue

  • Letters

    Letters to the Editors, December 1973

  • Recommended

    Books, December 1973

  • Mathematical Recreation

    Mathematical Games, December 1973

  • Amateur Scientist

    The Amateur Scientist, December 1973

  • Departments

    The Authors, December 1973

  • Annual Index 1973

  • Bibliography, December 1973

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December 1973

See the World from a Different Perspective

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