http://tagg.im/forum/physics 2012-05-21T00:15:04Z http://tagg.im/thread/115/desert-sand-helicopter-blades-pixie-dust-err-sparks Dolph 2011-07-19T03:13:10Z

So, apparently when you combine a desert and high speed helicopter blades kicking up lots of sand into the air, you end up with a light show of sparks