Syncing up time crystals can help harness energyNobi_Prizue/Getty ImagesTo store energy with a time crystal, make it a double. A mathematical analysis shows that putting two time crystals into a coordinated state could create a quantum battery-like device.Time crystals differ from other quantum states of matter by having a structure that repeats in time they cycle through the same set of configurations over and over without any energy input. Though physicists once worried that this would violate fundamental laws of physics and render them impossible, over the course of the past decade researchers have created