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"Silent Majorities" and the Vietnam War

Is there a majority opinion on American involvement in the war in Vietnam? A study of public-opinion polls indicates that most Americans are against the war but that motivations are mixed...

By Howard Schuman and Philip E. Converse

The Origin of Galaxies

The size, shape and other properties of the observed galaxies are traced to slight density enhancements in the expanding primordial fireball. Enhancements of certain mass were favored over others...

By Joseph Silk and Martin J. Rees

Genetic Repressors

Genes do not operate continuously but are switched on and off. One control mechanism is repression. Now the first specific repressors have been isolated, confining hypotheses put forward a decade ago...

By Mark Ptashne and Walter Gilbert

Computer Displays

Pictures "painted" rapidly and accurately by an electron beam under computer control are helping designers and engineers at many tasks. Computer displays can also help to clarify complex physical phenomena...

By Ivan E. Sutherland

How Snakes Move

They have four modes of progression, termed lateral, rectilinear, concertina and sidewinding. In lateral progression, the commonest mode, the snake uses its loops to push not downward but sideways...

By Carl Gans


Mountain glaciers all over the world have advanced several times since the end of the last major "ice age". Their fluctuations are a generalized record of global climatic changes over 6,000 years...

By Stephen C. Porter and George H. Denton

An Archaic Indian Cemetery in Newfoundland

Little has been known about the hunters and gatherers who roamed northeastern North America 4,000 years and more ago. The richness of their culture is now disclosed by work at a beach burial ground...

By James A. Tuck

The Clock of the Malaria Parasite

The life cycle of the protozoans that cause malaria is carefully timed so that they are most ready for transfer from victim to mosquito during the hours of darkness, when the mosquitoes are most likely to be feeding...

By Frank Hawking


  • 50 and 100 Years Ago: June 1970

  • Science and the Citizen: June 1970

  • Letters

    Letters to the Editors, June 1970

  • Recommended


  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Bibliography

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