You may have never heard of the solid metal cylinder known as Le Grand K, but it's most definitely impacted your life in countless ways. Le Grand K is kept in Paris, where it's been for over 120 years, and its purpose is to simply exist. You see, Le Grand K is the most perfect kilogram on the planet. For weight measurements to mean anything, every scale has to be calibrated on the exact same standard, and that's where this particular piece of ... (Date:11/13/2018 22:36) Read full article >>

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