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Every scifi movie. Ever.
In Czech, they used to be called “křemenné hodiny”, which has the same ring to it. If you told someone these words today, they would imagine a clock meticulously carved out of a quartz block.
Time crystals are a thing, they’re just not that thing.
But also any crystal used in a clock is a time crystal.
I have never felt dumber than while reading that article and condensed matter physics, whatever tf that is