Especially when you see photos like this one form Killcare nsw
http://news.ninemsn.com.au/glanceview/209366/qantas-steward-snaps-lightning-bolt.glance
Dry ice or propane expansion cools the air to such an extent that ice crystals can nucleate spontaneously from the vapor phase
http://en.wikipedia.org/wiki/Cloud_seeding
A cloud of diamond dust off the top of Sydney
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Especially when you see photos like this one form Killcare nsw...
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