[0]Blades used in conventional fans chop up air and cause uneven air flow. But now a new design can cool you down evenly. A motor driven rotor hidden inside a pedestal blows air up inside the hollow hoop. The airplane wing shape of the inner surface produces a low internal pressure. This encourages the surrounding air to create a draft which gets channeled through the ring. A stronger or weaker blast of air can be obtained by varying the speed of the rotor with a switch. This fan uses the same amount of energy used in conventional ones but since it has no blades it wont harm children if they poke their fingers inside.
Channel: newscientistvideo
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