While turning humidity into drinking water sounds like science fiction, research scientists at the Fraunhofer Institute for Interfacial Engineering and biotechnology IGB are attempting to turn it into reality. In their model, a saline solution that can absorb moisture, known as hygroscopic brine, runs down a tower-shaped unit and absorbs water from the air, which is then sucked into a tank. The moisture in the tank condenses and the water is collected into tubes. According to Siegfried Egner, head of the IGB, ?The process is based exclusively on renewable energy sources such as thermal solar collectors and photovoltaic cells, which makes this method completely energy-autonomous.? The engineers have created designs both for a single-person unit and a larger one to supply entire buildings.