Special forces can leave no trace and make no sound, but Samsung's Tango Stealth vacuum does them one better: not only is it quiet but it picks up the traces others have left. It's the latest in a long line of robo-vacs from the company and it's the quietest, making just 50db of noise while dutifully looking for targets of opportunity on your hardwood. It'll start shipping in Korea soon at a price of 750,000 Won -- about $670. Special faces do cost more than normal ones.
