This comic from Randall Munroe at xkcd is funny, due to the misunderstanding about how homeowner’s insurance works. But the concept of shining a backlight on your bathroom is a new one on me. Do we dare try it? Some people clean their toilets on a regular schedule, while others only clean it when it looks dirty. Urine glows under a UV light, which this page recommends for finding pet stain on a carpet. That seems like a good idea. But they also mention using a backlight to see how clean your hotel room is …and that can be frightening. There are some things it’s just better to not know.
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