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Features

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

The Brain's Own Marijuana

Research into natural chemicals that mimic marijuana's effects in the brain could help to explain--and suggest treatments for--pain, anxiety, eating disorders, phobias and other conditions

By Roger A. Nicoll and Bradley N. Alger

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

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

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