Add Yahoo as a preferred source to see more of our stories on Google. Does it seem as though the mold in your toilet bowl keeps coming back more quickly after cleaning? And that there's more of it?

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A photo of an office bathroom sign banning women from defecating at ...

World Toilet Day — that's today, Nov. 19 — is no joke. (Although clearly the German toilets pictured above have a sense of humor.) This day in honor of the loo was created by Jack Sim, a Singapore ...