By 2040, 33 countries are expected to face extreme water stress, according to the World Resources Institute, making the race to develop innovative solutions more furious than ever. Ap Verheggen has been on the cutting-edge of solar thought experiments for several years. You may recall his SunGlacier – a conceptual solar-powered leaf that produces water in the desert. Now he’s back with WaterDrop, a handheld solar-powered device that produces condensation for drinking. Ap acknowledges the…