Absolutely the best headline to appear while I was on my break had to do with the development of time crystals. It's an outgrowth from the concept of spin glass (another delicious invention) wherein the material cycles through several stable states without consuming any energy. "It has order and perfect stability despite being in an excited and evolving state." Anyhow, a Google team created one on a quantum processor that "employs a time-reversal protocol", and another team reports having created one in a diamond. Now I admit, this news has nothing to do with online learning. But it's an example of the sort of thing it's useful to keep an eye on, just in case.
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