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  World's Roundest Object! - YouTube

  https://www.youtube.com/watch?v=ZMByI4s-D-Y

  The world's roundest object helps solve the longest running problem in measurement -- how to define the kilogram. Support Veritasium on Patreon: http://bit.l...

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  Category:Engineering – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Engineering?uselang=de

  Keine Beschreibung vorhanden.

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