It’s worth reminding ourselves that even an enormous problem like 2.5 billion people who need sanitation does not always require an enormous solution. Small steps help.
As an example (hat tip to the excellent Matt Shipman), consider Tate Rogers, graduate student at N.C. State University, who applied technology no more complex than the Archimedes screw to the age-old problem of what to do once the pit latrine is full.
Read more at: http://blogs.scientificamerican.com/plugged-in/2012/11/19/inspiration-on-world-toilet-day/
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