We taste only four things: sweet, sour, salt and bitter. The smells really give things flavor. Talking with your mouth full expels taste molecules and diminishes the taste of food. Smells stimulate learning; studies show that 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 smell best if we take several short sniffs, rather than one long one. Much of the thrill of kissing comes from smelling the unique odors of another’s face. Women have a keener sense of smell than men.