Leaves and spiders' webs beaded with dew have inspired a low-tech solution for collecting fresh water. WatAir, an inverted pyramid made from elastic canvas, recycled polycarbonate, metal or glass, can reap dozens of litres of water a day from the air. The inexpensive solution could help bring clean drinking water to people in remote or polluted areas, its developers say. "The design has minimal special demands. It is low-tech and low-cost, and in fact can be even produced with local means," says Joseph Cory, a PhD candidate at the Technion-Israel Institute of Technology and an architect at Haifa's Geotectura Studio....