The powder that can turn sludge into clean drinking waterRion NakayaFebruary 18, 2019September 3, 2019
Poop Guy: A dad who is revolutionizing sanitation in Pune, IndiaRion NakayaMarch 25, 2014August 17, 2018
A Japanese social club cleans public toilets as a weekend hobbyRion NakayaSeptember 4, 2013December 7, 2016
