Well first, what is a crystal? It's a solid material in which atoms are arranged in a highly-ordered repeating pattern. Time crystals are states of matter whose patterns repeat at set intervals of time rather than space. Guests Paul Davies , Professor of Physics at Arizona State University Frank Wilczek , Herman Feshbach professor of physics at MIT Presenter Robyn Williams Broadcast  Sat 5 Aug 2023 at 2:02am Saturday 5 Aug 2023 at 2:02am Sat 5 Aug 2023 at 2:02am

https://www.abc.net.au/radionational/programs/scienceshow/what-is-a-time-crystal/102680490

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