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Have you ever wondered how we know what a kilogram actually is? [▻](https://video.twimg.com/ext_tw_video/2086889828012920832/pu/vid/avc1/720x1280/SU0hIFtDlwGJ

Quantum News • 2026-08-10 18:58 UTC • By Billy Odell Tucker-Robinson
Have you ever wondered how we know what a kilogram actually is? [▻](https://video.twimg.com/ext_tw_video/2086889828012920832/pu/vid/avc1/720x1280/SU0hIFtDlwGJ
Have you ever wondered how we know what a kilogram actually is? [▻](https://video.twimg.com/ext_tw_video/2086889828012920832/pu/vid/avc1/720x1280/SU0hIFtDlwGJJD8G.mp4)
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