PhysicsA super-thin slice of wood can be used to turn saltwater drinkable Most ways to purify saltwater take up a lot of energy, but simply running seawater through a thin, heated slice of porous wood can render it fresh and drinkable 51¶¯Âþ
HumansDon't miss: Green films, rare plants and a cosmos tour This week, watch how to save the world, explore what we're losing, then contemplate the heavens Culture