The week before Thanksgiving I discovered a small pile of white dust in the basement. I don't know where it came from. There is no obvious source. There is also a small crack where the baseboard is seperating from the drywall. I think the latter problem may be a side effect of our recent basement "flood". I hope it isn't a leak from our upstairs bathroom (directly above). The powder is a mystery I have apparently chosen to ignore. Good strategy for keeping up your home. ;-)