How to Make a Vortex in a Bottle : 11 Steps (with Pictures) - Instructables

How to Make a Vortex in a Bottle : 11 Steps (with Pictures) - Instructables

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Vortex : 4 Steps - Instructables

Vortex : 4 Steps - Instructables

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Vortex : 4 Steps - Instructables

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Tornado in a Bottle : 4 Steps - Instructables