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Re: [Phys-L] sparks from dust + helicopter blades



Interesting. Seems to me like the blades cause friction with the
dust/sand, creating heat/light, which follow the path of the blades.


Phys-L@Phys-L.org writes:
http://www.npr.org/blogs/krulwich/2013/07/30/206946740/mysterious-dancing-lights-in-afghanistan