Every year, 1.5 million young children die of preventable infectious diseases such as diarrhea because of poor sanitation, according to UNICEF. One out of every three humans on our planet -- some 2.2 billion people -- lack access to safe drinking water, and six out of 10 lack access to proper sanitation, meaning toilets or safely managed sewage systems. Residents of the Kibera slum in Nairobi, Kenya, can share one pit latrine with over 100 people. In Dharavi, Asia's largest urban slum located in Mumbai, India, 80% of its seven million residents have no running water, the National Observer has noted. What hope do they have of washing their hands frequently?