Squeeze Water out of Rocks. Myth or Magic?

Water resources in the world are scarce and unevenly distributed. In deserts, the only source of water is groundwater, often saline and of poor quality. This limits agricultural activities. In those places where farming does occur, groundwater levels have dropped dangerously due to overexploitation. However, a group of European scientists has come up with a method to green deserts. Gypsum, a rocky mineral abundant in desert regions where fresh water is usually in very short supply, could become a new resource out of which trillions of liters of clean drinking water can be extracted.