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The Necessity of Fission Power

If the U.S. must have sources of energy other than fossil fuels, the only source that can make a major contribution between now and the end of the century is nuclear fission

By H. A. Bethe

The Volcanoes of Mars

They apparently formed over the entire span of the planet's history. Their remarkable size may be related to the fact that the crust of Mars is not divided into moving plates

By Michael H. Carr

The Search for New Families of Elementary Particles

At least one particle that fits none of the established families has emerged from experiments with high-energy neutrinos. The new particle must exhibit some hitherto unobserved property of matter...

By David B. Cline, Alfred K. Mann and Carlo Rubbia

A DNA Operator-Repressor System

An operator is a segment of DNA adjacent to a gene; a repressor is a protein that binds to the operator and controls the expression of the gene. How such a system works in a virus is explored in detail...

By Tom Maniatis and Mark Ptashne


These shrimplike creatures are formidable predators. Two of their forward appendages are adapted either for spearing or for smashing. One blow from a smasher can break the shell of a good-sized clam...

By Roy L. Caldwell and Hugh Dingle

Paleoneurology and the Evolution of Mind

Tracing changes in the relation between brain size and body size in various groups of fossil and contemporary animals sheds light not only on the evolution but also on the nature of intelligence...

By Harry J. Jerison


There are several types of apparition to be seen across the sea or the land. Each has an explanation in terms of the optical properties of a fluid medium: the atmosphere

By Alistair B. Fraser and William H. Mach

Immunization against Smallpox before Jenner

Long before he introduced inoculation with cowpox, smallpox was prevented by inoculation with smallpox itself. The procedure was risky, but its spread in the 18th century set the stage for Jenner...

By William L. Langer


  • 50 and 100 Years Ago, January 1976

  • Science and the Citizen, January 1976

  • Letters

    Letters to the Editors, January 1976

  • Recommended

    Books, January 1976

  • Mathematical Recreation

    Mathematical Games, January 1976

  • Amateur Scientist

    The Amateur Scientist, January 1976

  • Departments

    The Authors, January 1976

  • Bibliography, January 1976

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