For the first time, researchers have charted the structure of olfaction, uncovering that the smell receptors in the nasal cavity adhere to a distinct arrangement. This significant discovery may allow physicians to identify Alzheimer's, Parkinson's, and specific cancers years prior to the onset of symptoms, potentially leading to new therapies for the 13 million individuals in the U.S. who experience smell loss, frequently following COVID and other viral illnesses.