Many researchers and inventors are looking for cheaper and faster ways to get clean drinking water to people who lack it. On the industrial scale, people are refining filtration membranes by using advanced materials like graphene to make more efficient potable water supplies. Others are using architecture to make rain-harvesting buildings. For individuals, one designer has made a solar power distiller to turn saltwater fresh. These are just a few examples of a lot of brainpower going in to help around 780 million people who have limited access to clean water.