It's not one of the best-known or most widely-celebrated of international days. It doesn't have a major celebrity spokesperson or designer accessory to promote it. But World Toilet Day is, arguably, one of the most important days on the calendar. Your loo, and the sanitation infrastructure you are perched on top of every time you do your daily business, is probably doing more to keep you healthy than any other medical advance made in the last 200 years. But in the world today, 2.5 billion people still don't have access to adequate sanitation and around 1.1 billion still practise open defecation, with health consequences that aren't difficult to imagine. Diarrheoal diseases cause around 2 million deaths each year, and almost all of those are the result of low-quality water supply, inadequate sanitation and poor hygiene. Locally and globally, though, there is good news. Grassroots, or bottom-up (pun intended), campaigns to bring toilets to every community are having startling success in many places. In Nepal, for example thousands of communities…
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