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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

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