Posted about Time Crystals before - somewhen last year, I think (don't make me search for the post LOL!); possibly a link to arXiv.org) - but things are moving forward at a rate of knots in that area.
And getting as weird / freaky as Quantum Spookiness:
"Normal crystals have an atomic structure that repeats in space - just like the carbon lattice of a diamond. But, just like a ruby or a diamond, they're motionless because they're in equilibrium in their ground state.
"But time crystals have a structure that repeats in time, not just in space. And it keep oscillating in its ground state.
"Imagine it like jelly - when you tap it, it repeatedly jiggles. The same thing happens in time crystals, but the big difference here is that the motion occurs without any energy.
"A time crystal is like constantly oscillating jelly in its natural, ground state, and that's what makes it a whole new form of matter - non-equilibrium matter. It's incapable of sitting still.
"But it's one thing to predict these time crystals exist, it's another entirely to make them, which is where the new study comes in."