Dan' de Bourgogne wrote:
Very interesting footage! For most of us, it remains certainly "anecdotic", but for scientists who play with milligramms, nanometers and the like, this is important, even if the key is "difference" between the "master sample" and the replica. Ah...finally something astonishing (for me quite incredible!) to share with friends while having a glass in a bistrot. Thanks a lot for sharing the "NEWS of the Year!
There are no longer actual "master standards". The seven primary units are all represented by definition now.