August 9, 2005
Research laboratories envision tools that could identify and track just about every person, anywhere — and sound alarms when the systems encounter hazardous objects or chemical compounds.
Many such ideas seem to leap from the pages of science fiction: An artificial nose in doorways and corridors sniffs out faint traces of explosives on someone’s hair. Tiny sensors floating in reservoirs detect a deadly microbe and radio a warning. Smart… read more