http://www.thegatesnotes.com/Topics/Development/Talking-to-Scientists-About-Toilets?WT.mc_id=04_29_2013_keyword_fb&WT.tsrc=Facebook

http://www.thegatesnotes.com/Topics/Development/Talking-to-Scientists-About-Toilets?WT.mc_id=04_29_2013_keyword_fb&WT.tsrc=Facebook

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