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[Phys-L] sparks from dust + helicopter blades

Someone sent me this and I was wondering if anyone had an opinion about what might cause such a phenomena:
http://www.npr.org/blogs/krulwich/2013/07/30/206946740/mysterious-dancing-lights-in-afghanistan

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'Before you open your mouth, just remember, the empty wagon rattles the loudest.'
-- my dad

kyle forinash
kforinas@ius.edu<mailto:kforinas@ius.edu>