How to make a better water filter? Turn it inside out
(PHYSorg.com Nanotechnology)

More than 800 million people lack access to clean and safe water. Recent advances in water filtration technology have created new ways to filter water and make it drinkable, but many of these applications are too costly and cumbersome to be used in remote parts of the world. Reverse osmosis, for example, can make sea water drinkable, but the process is incredibly expensive and requires a large amount of energy.