Nuclear clocks help to fine-tuning location out in deep space, which is how we can improve bandwidth communications with probes. Last December we got a report about it, specifically Thorium-229. Be great if we had a lot of this. We don't, of course; it is radioactive such that it tends to be found only in uranium waste.
What we do have a lot of, is Thorium-232. This is a chemical proxy for Th-229; so suppose we ran experiments on this to see how little Thorium(-229) we actually need to make a clock. That seems to have happened: electroplating onto iron. "Stainless steel" if you like.
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