Tuning up Dr. Bell - ORNL researchers at can detect explosives at distances exceeding 20 yards using a laser and a device that converts reflected light into sound—a variation of a technique originally demonstrated by Alexander Graham Bell in the late 1880s.

Tuning up Dr. Bell

ORNL researchers at can detect explosives at distances exceeding 20 yards using a laser and a device that converts reflected light into sound—a variation of a technique originally demonstrated by Alexander Graham Bell in the late 1880s. (more)