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A comment on Why scientists are redefining the kilogram.
https://www.washingtonpost.com/news/speaking-of-science/wp/2...
Redefining mass based on an idea as opposed to a physical object took me some time to get my head around.
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https://www.washingtonpost.com/news/speaking-of-science/wp/2...
Redefining mass based on an idea as opposed to a physical object took me some time to get my head around.