I must admit, that when I first heard of this, I was as ignorant as some of you must be. The tale goes that some people, pregnant women in particular, can leave stains on the seat of the toilet when they visit the bathroom. What makes this such an intriguing mystery is that some people have reported the staining to be blue.
It turns out, the stain is due to a chemical reaction between certain toilet seats and certain fats in our sweat. Newer toilet seats have an anti-microbial chemical sprayed on them, that when it comes in contact with fat from our sweat, can result in a yellow discoloration. Yellow, I thought we were talking about blue, you say. The blue color comes from the different diets people consume, though most generally the discoloration is yellow in color.
The episode is very good, I’d recommend you listen to it.
