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Iran's Nuclear Puzzle

Rich in fossil-fuel resources, Iran is pursuing a nuclear power program difficult to understand in the absence of military motives

By David A. Schwarzbach

Configurable Computing

Computers that modify their hardware circuits as they operate are opening a new era in computer design. Because they can filter data rapidly, they excel at pattern recognition, image processing and encryption

By John Villasenor and William H. Mangione-Smith

Early Hominid Fossils from Africa

A new species of Australopithecus, the ancestor of Homo, pushes back the origins of bipedalism to some four million years ago

By Alan Walker and Meave Leakey

Panoramas of the Seafloor

Modern sonar techniques map the continental margins of the U.S. and reveal the richly varied scenery usually hidden underwater

By Lincoln F. Pratson and William F. Haxby

Searching for Digital Pictures

Computers that can reason about images may be able to pick out distinct features of a person, place or object from photograph archives

By David Forsyth, Jitendra Malik and Robert Wilensky

Overcoming the Obstacles to Gene Therapy

Treating disease by providing needed genes remains a compelling idea, but clinical and basic researchers still have much to do before gene therapy can live up to its promise

By Theodore Friedmann

Nonviral Strategies for Gene Therapy

Many drawbacks of viral gene delivery agents might be overcome by nonviral systems. Studies in patients suggest these systems have potential as therapies and as vaccines

By Philip L. Felgner

Gene Therapy for the Nervous System

Inserting genes into brain cells may one day offer doctors a way to slow, or even reverse, the damage from degenerative neurological disease

By Dora Y. Ho and Robert M. Sapolsky


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