Glass cells filled with liquid crystals respond to light to make the first time crystals visible to the naked eye, even if you’d still get a better view using magnification. Previous time crystals have mostly been curiosities, but the makers claim these could be used to store data more efficiently or make almost unforgeable watermarks. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Despite the science fiction-sounding name, time crystals will not transport you back to your favorite era. Instead, they get their name because where ordinary crystals have a repetitive pattern in space, time crystals’ patterns reoccur over time . Imagine a crystalline form of any cyclic object, such as a pendulum that regularly returns to the same loc

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