It hasn't made a lot of headlines, but as of today the metric system is fully defined in terms of measurable physical constants, no longer relying on the International Prototype Kilogram or any other unique object. Here's a neat website from NIST with a bunch of background and explainers about the change. (Be sure to click around—there's a bunch of more in-depth pages here.) https://www.nist.gov/si-redefinition/meet-constants
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