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Dan stumbles around Wikipedia trying to define the Kilogram.

Sources

https://www.wikiwand.com/en/2019_redefinition_of_SI_base_units

https://www.theverge.com/2018/11/13/18087002/kilogram-new-definition-kg-metric-unit-ipk-measurement

https://physics.nist.gov/cuu/Units/kilogram.html