A team at the Washington University of St. Louis have developed a purification method using graphene oxide and nanocellulose foam. The process is just evaporation, but with very condensed heat to spur the transformation. What sounds like a middle school science experiment (with slightly more complex materials) could viable change access to drinking water worldwide.

Source: http://phys.org/news/2016-07-dirty-drinkable-hybrid-nanomaterials.html

Image Source: By Sandor Diego Weijn (Flickr: lake Ohrid) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons