Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Physics
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!
