I'm up against the limits of my personal knowledge when it comes to time crystals, so I'm hoping someone can point us to a primer, or a prerequisite so the average person (that would be me!) can glean a basic understanding of what time crystals are, and how they apparently breach the second law of thermodynamics, which essentially says that perpetual motion is impossible.
I won't go into much depth, but one of the simpler explanations I've found has been here:
Feb 10, 2017 - "Discovery of Time Crystals Could Radically Change Our Understanding of the Space-Time Continuum" by Philip Perry on bigthink.com
But it's still not simple enough. Does anyone know of a step-ladder we can use to peek over this fence?