The world might run out of a crucial ingredient of touch screens. But don’t worry, we’ve invented an alternative

We have no guaranteed long-term supply of indium. It is naturally found only in tiny traces, and is therefore impractical to mine directly. Almost all of the world’s indium comes as a byproduct of zinc mining. Fortunately, we have a potential solution: my colleagues and I have developed a new way to make optically transparent and electrically conductive coatings without indium.