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Comments by "Mar" (@swunt10) on "How We're Redefining the kg" video.
they could have done that but then scientists would have to be careful not to mix up the old meter with the new meter. but yes, defining the speed of light to be exact 300000m/s would have been more elegant but in 18th they didn't know that and if we change it now we would end up with a legacy meter and a new meter making everything more difficult.
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