Mere days before Christmas, a friend from church was mopping the floor in her house. This seemingly routine activity yielded results that were anything but routine. She slipped and fell, injuring one leg so severely that a previously scheduled knee replacement on the other leg had to be postponed indefinitely. Had this been an isolated incident, I would not have thought further of it, other than feeling sad for my friend. But as it happens, another friend had a similar injury this past summer—and from the same activity. What if housekeeping, and especially cleaning, is more dangerous than we think?