uh-oh, what are those silly europeans going to do NOW?

Shrinking kilogram bewilders physicists
PARIS - A kilogram just isn’t what it used to be. The 118-year-old cylinder that is the international prototype for the metric mass, kept tightly under lock and key outside Paris, is mysteriously losing weight - if ever so slightly.

Physicist Richard Davis of the International Bureau of Weights and Measures in Sevres, southwest of Paris, says the reference kilo appears to have lost 50 micrograms compared with the average of dozens of copies.
"The mystery is that they were all made of the same material, and many were made at the same time and kept under the same conditions, and yet the masses among them are slowly drifting apart," he said. "We don’t really have a good hypothesis for it."

The kilogram’s uncertainty could affect even countries that don’t use the metric system - it is the ultimate weight standard for the U.S. customary system, where it equals 2.2 pounds. For scientists, the inconstant metric constant is a nuisance, threatening calculation of things like electricity generation.
"They depend on a mass measurement and it’s inconvenient for them to have a definition of the kilogram which is based on some artifact," said Davis, who is American.

But don’t expect the slimmed-down kilo to have any effect, other than possibly envy, on wary waistline-watchers: 50 micrograms is roughly equivalent to the weight of a fingerprint.
"For the lay person, it won’t mean anything," said Davis. "The kilogram will stay the kilogram, and the weights you have in a weight set will all still be correct."

DAMN! So close.