What causes static in a coffee grinder's receptacle? What causes static in a coffee grinder's receptacle? 

The question of how to reduce static has been asked multiple times on cooking SE (see https://cooking.stackexchange.com/search?page=1&amp;tab=Relevance&amp;q=coffee%20static). However, I can't find a legitimate answer as to why ground coffee has static build up. Some discuss moister in the beans, but how is that related to static?
I don't know anything about burr grinders, but with blade grinders you generally get tiny bits of coffee bean being spun quickly around the outer edge of a plastic enclosure. This is a recipe for generating static electricity by the triboelectric effect, the same as rubbing a balloon on your hair or shuffling your feet across a polyester carpet.