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Three trillion dollars a year
As for worries of nicks in your maple, robot vacuums and their brushes are purposefully designed to maneuver across hardwood floors without scratching them. Most modern robovacs, even the ones that aren't super advanced otherwise, have floor type sensors that tell the vacuum when it's time to unleash the most intense suction (on carpet and rugs) and when it's time to vacuum more gently (on hard floors).