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Angel dust may refer to: 1  A common name for the drug phencyclidine (PCP). 2  A common name for the drug clenbuterol. 3  Angel dusting, the misleading marketing practice of including a minuscule amount of an active ingredient in a cosmetic, nutritional supplement, or food product, insufficient to cause any measurable benefit.
STORY HIGHLIGHTS. ' 1 Smart dust' refers to tiny sensors that would monitor everything on Earth. 2  The concept was dreamed up by an academic in the 1990s. 3  But it is becoming increasingly real, as companies deploy wireless sensor networks. 4  HP says it aims to put a trillion sensors all over the globe.