A controversial theory of olfaction deemed implausible

Humans can discriminate tens of thousands of odors. While we may take our sense of smell for granted, it adds immeasurably to our quality of life: the aroma of freshly brewed coffee; the invigorating smell of an ocean breeze or a field of wildflowers; the fragrance of a lover or the natural smell of a baby. Our olfactory sense also warns us when milk turns rancid, when a baby's diaper needs changing and when there's a gas leak. In animals, the sense of smell is essential for detection of predators and other dangers, food sources and mates.

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