Women have a keener sense of smell than men. By simply smelling a piece of clothing, most people can tell if it was worn by a woman or man. Each of us has an odor that is, like our fingerprints, unique. Smells stimulate learning. Students given olfactory stimulation along with a word list retain much more information and remember it longer.
Many smells are heavier than air and can be smelled only at ground level.
We can smell best if we take several short sniffs, rather than one long one.