Michael Lindenmayer was working on a slum project in a developing country when he encountered a child who was up to her waist in human excrement. The child was in an area where slum dwellers defecated in the open. Lindenmayer then promised himself that he would do all in his power to combat the problem - and the idea for ToiletHackers was born. Michael will tell us about how far he’s come since making that promise to bring to people in developing countries something we take for granted - toilets. (Photo: Courtesy of Toilet Hackers)