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Advances in materials and mechanical design make it possible to use giant flywheels for the storage of energy in electric-power systems and smaller ones for the propulsion of automobiles, trucks and buses...

By Richard F. Post and Stephen F. Post

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

Slips of the Tongue

They are a good deal more than amusing (or embarrassing) errors of speech. The collection and analysis of such errors provides important clues to how speech is organized in the nervous system...

By Victoria A. Fromkin


  • 50 and 100 Years Ago, December 1973

  • Science and the Citizen, December 1973

  • 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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