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, 2014June 21, 2020
A Japanese social club cleans public toilets as a weekend hobbyRion NakayaSeptember 4, 2013October 14, 2019
