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Researchers create 'time crystals' envisioned by Princeton scientists
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Scientists unveil new form of matter: time crystals | Berkeley News
Nonlinear two-level dynamics of quantum time crystals | Nature Communications
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How quartz watches and clocks work - Explain that Stuff
Quartz Movement Battery Clock | American Time
Quartz Movement Battery Clock | American Time
How Does a Quartz Watch or Clock Work? - Chelsea Clock
Yale physicists find signs of a time crystal | YaleNews
Quartz clock - Wikipedia
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Quartz Movement Battery Clock | American Time
Quartz Movement Battery Clock | American Time
Clock - Battery Electric, Master System, and Quartz Crystal | Britannica