Get That Healthy Glow

Shining a certain kind of light on body tissue produces a glow that shows changes in the tissue, including cancer. The use of such biomedical optics will some day be able “to detect disease directly without taking tissue from the body,” says Robert R. Alfano, a distinguished professor of science and engineering at City College. “It’s sort of like ‘Star Trek,’ ” he says. “They scan your body, and you can get information directly.”