They’re unfortunately way less interesting than the name, at least for non-scientists. A normal crystal has a repeating pattern to its structure. Maybe the atoms form hexagons that are connected in rows. In a time crystal, there is a similar situation except the pattern changes periodically. The atoms sit in one pattern for a little while then switch to another pattern for a bit and then keep switching back and forth. Since it’s not a set pattern unless you take time into consideration, they got the name “time crystals.”
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