Wireless power transmission is fantastic in theory -- but in practice, due to some pesky laws of physics, the range of transmission is extremely limited. Yes, you can now charge your phone by putting it on a wireless power transfer plate, but that plate still needs to be plugged into the wall, and -- more importantly -- you still have to remember to put your phone on the plate. What would really make wireless power transmission (WPT) useful is if you could power a device that's still in your hands or pocket. By using metamaterials, Duke University might have discovered a way of doing just that.