When a bull market is in full swing, life ought to include around-the-clock robot servants that tend to your every need. This would seem to explain the success of Roomba by iRobot, a wandering gizmo that vacuums your entire floor like Rosie from The Jetsons - without all that annoying sass. But these days, it looks like consumers may be resorting to manual labor: The company's stock price has been more than halved since September.

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