Introduction of water tanks. 

Kibera was densely populated and that led to less amenities. some many live without food but not water. water in kibera was big problem which people faced. Water was beginning to get lost because there were tanks. 
Probably an organisation called AMREFF surprised many people. it made people jump in exactly as they started living happily.
So many people benefited from the organisation The problem is that the resident never said Thank you. 

Location: Silanga, Nairobi , Kenya