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b_350_0_16777215_00_https___upload.wikimedia.org_wikipedia_commons_thumb_2_20_FilterDiagram.svg_1056px-FilterDiagram.svg.pngNearly 800 million people worldwide don't have access to safe drinking water, and some 2.5 billion people live in precariously unsanitary conditions, according to the Centers for Disease Control and Prevention. Together, unsafe drinking water and the inadequate supply of water for hygiene purposes contribute to almost 90% of all deaths from diarrheal diseases -- and effective water sanitation interventions are still challenging scientists and engineers.

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