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Take a lighted agarbatti (joss stick) and make sure of two Things: (1) the stream of smoke is clearly visible and (2) there is no Draught to disturb it. Now give gentle tugs of the wrist. At a certain Optimal amount of such tugging you can see rings of smoke forming in the Emanating chaotic smoke stream. I dont know if this is a known phenomenon or Not. If not, let the rings be known as owaiss rings. The question is, What causes these rings?

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