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The problem with hand vacuums is that they generally don’t work very well. So Dyson’s engineers not only added software that gives the Root 6 consistent suction no matter how much battery life is left, they optimized their cyclonic system—which uses a tornado-like force in a canister to pick up dirt—to fit the coffee-pot-size space. The proportions for a smaller vacuum required the cones that spin the air around to be taller than usual. The formula works: The twirling air exerts a force 70,000 times the strength of gravity, enough to lift a 2x4. $150; dyson.com
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