BARCELONA, Spain--Want a truly unbreakable cell phone screen? Lab-grown sapphire could be the screen of the future. In this demo unit we saw at Mobile World Congress, a sapphire cover screen is glued on top of the phone's glass screen. Despite the double layers of material, the phone was still just as responsive.
A rock and a hard place
I hit and dragged a piece of craggy concrete repeatedly against the screen.
What happened? Nothing. There wasn't a crack, scratch, or sign of any pitting, just a tiny amount of concrete fairy dust that wipes away with your thumb.