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Scientists Finally Observed Time Crystals—But What the Hell Are They?

My first question was, “What is a time crystal?” Harvard graduate students Soonwon Choi, Joonhee Choi and postdoctoral researcher Renate Landig all started laughing. “That’s a very good question,” said Soonwon. The time crystal’s silly science fiction name shrouds its deep quantum mechanical nuance. Sometimes a name…

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