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The Verification of the SALT II Agreement

The U.S. has at its disposal ample "national technical means" of surveillance to detect any attempt by the U.S.S.R. to gain a significant military advantage by violating a new arms pact

By Les Aspin

How Bird Eggs Breathe

Bird embryos take up oxygen and discharge carbon dioxide by simple diffusion through microscopic pores in the eggshell. The process is regulated largely by pore geometry, which varies among bird species...

By Hermann Rahn, Amos Ar and Charles V. Paganelli

Lake-Bottom Archaeology

Mountain lakes from France to Austria and from Germany to Italy attracted many prehistoric settlers. Underwater archaeologists are now investigating sites that once were only dredged by collectors...

By Aimé Bocquet


The management of a forest by such techniques as the selective harvesting of trees, prudent thinning and planned reforestation can double and perhaps even triple the productivity of the forest...

By Stephen H. Spurr


They are waves that do not disperse or dissipate but instead maintain their size and shape indefinitely. A recent finding is that solitons may appear as massive elementary particles

By Claudio Rebbi

The Source of the Earth's Magnetic Field

The source is believed to be a dynamo set up by the ponderous flow of matter in the earth's core, but what drives the flow? It may be the gravitational energy released by the sinking of heavy material...

By Charles R. Carrigan and David Gubbins

Genes That Violate Mendel's Rules

In sexual reproduction the parental genes are continually reshuffled and thereby exposed equally to the stringent test of natural selection. Some genes cheat, subverting the process to favor their own survival...

By James F. Crow

The Medical Influence of the Stethoscope

The first instrument generally used for diagnosis, the stethoscope transformed the practice of medicine in the 19th century, altering the physician's picture of disease and his relation to the patient...

By Stanley Joel Reiser


  • 50 and 100 Years Ago, February 1979

  • Science and the Citizen, February 1979

  • Letters

    Letters to the Editors, February 1979

  • Recommended

    Books, February 1979

  • Mathematical Recreation

    Mathematical Games, February 1979

  • Amateur Scientist

    The Amateur Scientist, February 1979

  • Departments

    The Authors, February 1979

  • Bibliography, February 1979

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