Dust bunnies form from the surprisingly large supply of stuff in the air, including fibers from clothing fabrics and carpeting; hari; animal fur and dander; and especially human skin cells and dust mites that feed on them...Fibers have an electric charge that causes things to stick to them, so dust bunnies are more common in carpeted houses, which have a larger supply of fibers.
Dust Bunnies
by C. Claiborne Ray
http://tv.nytimes.com/learning/students/scienceqa/archive/20060321.html
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