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In school, I was quite fascinated to read about the lengths scientists went to to create standards for measurement. The world standard for Kilogram is locked and preserved well in France since more than a century. The issue is that the kilogram is no longer a kilogram now – despite all precautions, the master kilogram has lost weight to the tune of micrograms. That shouldn’t be too bothersome except that it is a standard and standards don’t lose their standard! Here’s a well-written write-up on what’s going on in the standard kilogram’s life. The write-up will also tell you interesting things about the other SI units of time and distance.