The article mentions a potential application using lenses with incredible properties. Could one use these materials to make a lens that focuses x-rays? It has been postulated for decades that if one could use an x-ray light source for microscopy, it would be possible to observe the machinery of cells in real time (assuming the energy doesn't obliterate the cell). My understanding is that it isn't possible to make a lens to focus an x-ray as you can with visible light or using magnetic fields for electron microscopes. If these materials allowed this, it would usher in an incredible era of biological understanding.