science.
Engen, a psychologist at Brown University, identifies two distinct types of olfactory memory: the ability to call up the sensation of a particular odor and the ability to identdy a smell when presented. New research has illuni-nated these Merences.
Until recently, researchers classified odors the "smell prism," de- veloped by German psychologist Hans Henning over 70 years ago. The prism separates all odors into six categories, such as "flowery," "spicy,"...