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The First Nuclear Clock Will Test if Fundamental Constants Change
(www.quantamagazine.org)
This is a most excellent place for technology news and articles.
That’s what they were saying. We know OP doesn’t say zed because you’d expect to get “CZM” saying it that way. We know OP says zee because the dictation mistakenly typed CZM instead of the desired Cesium - the atom used in atomic clocks.