Water-repellent surfaces that last

In the first part of this video, the effects of condensation on three different surfaces are compared: On the left, a bare silicon surface, showing how water droplets remain “pinned“ in place as they get bigger and bigger; in the center and right panels, two different rare-earth oxide ceramic surfaces, cerium oxide and erbium oxide, show how the droplets do not stick and instead are rapidly shed from the surface, increasing the efficiency of the condensation process. In the second part, a rare-earth