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Mt Etna has formed a very circular crater (it has several craters) that is currently blowing out vortex rings. It's very rare and quite a beautiful sight. (from Nature)
Vortex rings are wonderful.. I suspect an early warning sign that a teenager will wander into physics is constructing vortex cannons or playing with vortices in water (I did both). Dianna posted a wonderful exploration about ten years ago.
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