This could be big. The world is facing a water crunch, at least when it comes to the stuff we can drink. Salt water covers 80% of the planet, but making it potable costs a bundle in energy; either to boil seawater (to release freshwater steam) or force it through inefficient filters to remove impurities. So far, only rich countries like Saudi Arabia or Singapore can afford desalination plants to do the job. That could change. Some years ago, researchers at Manchester University discovered they could create layers of Graphite only one atom thin, called Graphene. Scientists at MIT then discovered that Graphene is potentially a highly efficient water filter, one that requires very little energy to force the water through. This could mean that poorer countries will be able to afford desalination plants, which could in turn convert large arid regions into fertile farmland.