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current | 16:12, 7 February 2008 | 631 × 863 (452 KB) | File Upload Bot (Magnus Manske) | {{BotMoveToCommons|en.wikipedia}} {{Information |Description={{en|A 1-kg single-crystal silicon sphere for the Avogadro Project is shown above in the hands of Master Optician Achim Leistner at the [http://www.acpo.csiro. |
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- 2019 redefinition of the SI base units
- Achim Leistner
- Alternative approaches to redefining the kilogram
- History of the metric system
- International System of Units
- Wikipedia:Top 25 Report/May 3 to 9, 2015
- Wikipedia:Wikipedia Signpost/2015-05-13/Traffic report
- Wikipedia:Wikipedia Signpost/Single/2015-05-13
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