If you drop coffee on a surface, eventually the water evaporates, and there's a ring left at the outer edge that contains concentrated coffee particles. With this principle, researchers created a solar-powered desalination device that removes salts from ocean water and leaves solid salts that contain valuable minerals such as lithium. Read about this solar-powered desalination method - without the drawbacks of traditional desalination. More in the link in our bio! [Images: J. Adam Fenster, University of Rochester] #Desalination #InternationalCoffeeDay #Environment