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The Dinosaurs of Arctic Alaska

Seventy-five million to 70 million years ago, a group of hardy dinosaurs thrived in the harsh climate of what is now northern Alaska

By Anthony R. Fiorillo

Are Viruses Alive?

Although viruses challenge our concept of what "living" means, they are vital members of the web of life

By Luis P. Villarreal

Optics and Realism in Renaissance Art

A much publicized assertion holds that 15th-century painters achieved a new level of realism with the help of lenses and mirrors. But recent findings cast doubt on that idea

By David G. Stork
The 2004 Scientific American 50 Award
The Sciences

The 2004 Scientific American 50 Award

Our third annual salute to the people and institutions brightening our future recognizes accomplishments in stem cells, nanocomputers, mini fuel cells and more

By THE EDITORS
The Case of the Pilfered Planet
Space

The Case of the Pilfered Planet

Did the British steal Neptune?

By William Sheehan, Nicholas Kollerstrom and Craig B. Waff

Departments

  • Marijuana Research

  • The Brain's Own Marijuana

  • Letters

    Errata

  • Advances

    Firing on Half-Cylinders

  • Nanosize Me

  • Stormy Weather

  • A Mini Human Species

  • The Beat Goes On

  • So Much for Green Salvation

  • Wave-Riding Electrons

  • Stressing Violence

  • Excluding Inclusion Bodies

  • Recommended

    Orangutan Technology

  • Skeptic

    Common Sense

  • Anti Gravity

    Number One

  • 50, 100 & 150 Years Ago

    Necessary Protein -- Wild Herbs -- Unfiltered Water

  • In Brief

    Brief Points: December 2004

  • By the Numbers

    Thwarting Big Brother

  • Technicalities

    More Than Just Music

  • Working Knowledge

    Crowded Skies

  • Insights

    Geographer of the Male Genome

  • Ask the Experts

    Ask the Experts

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