Water may cover the majority of the planet's surface, but thanks to a huge helping of salt, it's hard to tap into as a source of drinking water. Once again, graphene could come to the rescue. Researchers at the University of Manchester have developed a graphene-oxide membrane with a scalable, uniform pore size that can filter out even the smallest salts, without affecting the flow of water too much. Desalination plants already use a variety of techniques to produce safe drinking water, including shocking the salt and water into separating, using salt-attracting membranes, or harnessing the power of ocean waves…