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I know what you're thinking -- how can you combine the awesome power of electrical generation with the subtle charms of your housecat? The Wool Ball hybrid humidifier, designed by a certain Yuan Gu for the Chinese firm Yadu, gets its power from the playful swipes of your pet -- or from a wall socket, if your tabby is as lazy as ours. There's no telling when this one will make it to market, but sometimes gadgets are better in the abstract anyways.