World Toilet Day

Billions of people around the world don't use flush toilets. That's why there are so many signs that explain what to do — and what not to do.

"My Toilet," a new photo exhibit in London, documents how commodes — or the lack of a proper one — affect the health, safety and education of girls and women around the world.

The Singapore activist created World Toilet Day in 2001, got U.N. sponsorship last year and posed for us on a toilet outdoors on a freezing day. That's how committed he is to bringing toilets to all.

They say every dog has its day. So does every toilet. And that day is today: World Toilet Day.