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How could a standard weight fluctuate? Doesn’t that really mean everything else in the universe had their weight fluctuate?

The different national prototype kilograms are varying from the international prototype kilogram, and from each other. By values, by the way, which represent exceedingly tiny amounts. If the International Prototype Kilogram masses exactly 1 kg, the United States Prototype Kilogram masses 1.000000019 kg.

I yield second place to no man in my disgust for the French. But the plain and simple truth is that SI is superior to the archaic, illogical system we use in the United States, despite the fact that it was invented in France. Ignoramuses and xenophobes blocked its adoption here, which has the result of putting American children at a disadvantage in the sciences... since scientists worldwide use SI, but non-American scientists have an intuitive grasp for the mass of a kilogram or the length of a meter that was developed since birth. And I see this same ignorance and xenophobia on display in this very thread by people who apparently are unaware that the pound is defined in terms of the kilogram, you blockheads.

“I yield second place to no man in my disgust for the French. But the plain and simple truth is that SI is superior to the archaic, illogical system we use in the United States, despite the fact that it was invented in France. Ignoramuses and xenophobes blocked its adoption here, which has the result of putting American children at a disadvantage in the sciences... since scientists worldwide use SI, but non-American scientists have an intuitive grasp for the mass of a kilogram or the length of a meter that was developed since birth. And I see this same ignorance and xenophobia on display in this very thread by people who apparently are unaware that the pound is defined in terms of the kilogram, you blockheads.
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So much ignorance in one paragraph. Kids have an “intuitive grasp” of the meter and kilo?? Really? What was their basis of knowledge, their ability to see light travel and accurately define it to 3Mm/s??

Oh, yeah, knowing a different unit for length or weight has most definitely put us at an absolute disadvantage in sciences here in the US.

NOT! Big hairy deal. It doesn’t make one illiterate or less capable using a different unit.

"the pound is defined in terms of the kilogram, you blockheads" Actually, yes and no. Because the SI system was forced upon the standards community the definition of a pound is a measurement against the kilo, yet, the pound still exists as it has for centuries against the grain, exactly 7,000 grains per pound, a more meaningful definition than the kilo. The pound, defined as 0.453592338 kg, is a useless definition as no one here can possibly use an instrument that accurate.

In fact, the grain is the unit of measure for firearms, including gun powder and bullets, both measured as grains. Many other scientific sectors also use the grain. The kilo is a useless measurement and was nothing more than an abitrary measurement.

The metre or meter[1] (symbol: m) is the fundamental unit of length in the International System of Units (the SI). It was originally defined so that the land distance between Earth's poles and Equator would be exactly 10,000,000 metres; today, the way it is defined means the speed of light is exactly 299,792,458 metres per second [2].

I guess the Nautical mile wasn't known by those wishing to create yet another units of measure.

Nonsense. If you need an "intuitive grasp" of anything that is readily supplanted through the use of a handy pocket calculator ~ and down to an incredible number of positions past the decimal point.

What you need an "intuitive grasp" of is space in 17 dimensions silly, primitive Hu-Mon.