Berck got us robot floor cleaners for Christmas, one for upstairs and one for downstairs. They’re apparently smart enough not to fall downstairs (at least the upstairs one is; the downstairs one might well be an idiot). They can vacuum and mop. They’re surprisingly fairly good at all-terraining it over doorway thresholds. They don’t do a terribly good job at cleaning, but they work hard (if you choose the work hardest setting), and the floors are a lot cleaner than when they don’t clean. They also freak the cat out. They aren’t very loud, which is good, because the house can get…