Since 2013, the United Nations has observed November 19 as World Toilet day in order to raise awareness on unequal access to "safe toilets" across the world.
According to the UN, more people in the world have phones than toilets, with some 3.6 billion people unable to access clean water and hygienic facilities.
But while there is a serious message to get across on this international day, it’s also a day to appreciate the various innovations made to advance the most humble privy.
Here’s our top five
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