Eliminating Nuclear Warheads
More than 50,000 nuclear weapons may be decommissioned during the next 10years. Their disposal requires both technical and political innovations
Volume 269, Issue 2
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Features
Faster than Light?
Experiments in quantum optics show that two distant events can influence each other faster than any signal could have traveled between them
T Cell Anergy
When cells of the immune system "see" antigens in the absence of the right cosignals, they shut themselves down instead of attacking. Future therapies might capitalize on that reaction
A Universe of Color
Color photography continues to be an important astronomical tool that reveals details of celestial objects not yet captured by modern electronic detectors
Mastering Chaos
It is now possible to control some systems that behave chaotically. Engineers can use chaos to stabilize lasers, electronic circuits and even the hearts of animals
Diet and Primate Evolution
Many characteristics of modern primates, including our own species, derive from an early ancestor's practice of taking most of its food from the tropical canopy
The Great Radium Scandal
William J. A. Bailey grew rich from his radium-laced patent medicine until it killed a leading socialite. The scandal helped to usher in modern standards of radioisotope regulation