As they defined it, it occurs when airborne molecules from decomposing plant or animal matter become attached to mineral or clay surfaces. (scientificamerican.com)
Moms might give off airborne molecules called pheromones that spur changes in the biochemistry of dads. (businessinsider.com)
The triggering substances are often structurally unrelated and range from airborne molecules to ordinary drugs and supplements, lotions, detergents, soaps, newsprint and once - cherished foods like chocolate, pizza or beer. (discovermagazine.com)