Askwsar Hilonga, Ph.D., a chemical engineer and public health scientist in Tanzania, grew up dealing with waterborne diseases such as cholera that made him ill. According to the World Health Organization, he has used his scientific expertise and local knowledge to develop a purification system based on nanomaterials. While the filter is still under study, stations have been set up throughout Tanzania, mostly managed by women, to help those that otherwise would not have safe drinking water.