From a scientist’s point of view, there are no limits. Why can’t your smartphone measure the exact chemical composition of all the food you eat, the air you breathe, and the water you drink? It easily could. Why can’t the walls of your house be incredibly stable and heat insulating, while simultaneously thin, light, and even act as a huge screen? They could be. Such advances are not science fiction — the basic principles underlying them have basically been sitting on the shelves of our labs for decades, waiting for the right hands to bring them to life in our everyday world.