Sanitation is one of the most critical issues that developing countries face. Worldwide, about 2.5 billion people lack adequate sanitation facilities, and each year about 700,000 children die from diarrhea. One noteworthy effort to solve this problem is the Reinvent the Toilet Challenge, which the Bill & Melinda Gates Foundation launched in 2011. According to the foundation’s website, the initiative aims to promote the creation of “a truly aspirational next-generation product that everyone...


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