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Review title: Physics
Product review: Of course it doesn't work: Fans do not create air. Instead, they suck in air from one spot and add energy (in the form of speed/flow), then permit its outflow in the form of a breeze. No inflow, no outflow. What flows in, flows out. The umbrella blocks inflow, so outflow, by definition and design, will be strictly limited. Of course it doesn't work!
