YouTube Description: The world's roundest object helps solve the longest running problem in measurement -- how to define the kilogram.
posted by Zifnab![Ranked #4 - 102072 votes - 2679 star points](https://videosift.com/cdm/stars/galaxy/zifnab.png?v=5)
This playlist is meant to include videos that follow the human understanding of the nature of things and the world through history.
YouTube Description: The world's roundest object helps solve the longest running problem in measurement -- how to define the kilogram.
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