The World’s Roundest Object: A Silicon Sphere Redefining the Kilogram Imagine an object so perfectly round that even the most advanced microscopes struggle to find any imperfections. That’s the reality of a silicon sphere created by the National Institute of Standards and Technology (NIST) in the United States. This remarkable object, measuring just 93.75 millimeters … Continue reading The World’s Roundest Object: A Silicon Sphere Redefining the Kilogram More