Dust is many things. At its most elemental, dust is a blend of dead skin, hair, fibers from clothing and other textiles, soil, pollen, dander, insect corpses, dust mites. Dust can be a health hazard, especially for those with respiratory or skin conditions that are irritated by the presence of all those fine particulates. Dust is also gross (again, dead skin and insect corpses). And then there is this: Dust is sneaky.