(via Metafilter)
The kilogram is losing weight! (NYT link requries registration)
At least, the refence kilogram, defined by a platinum-iridium cylinder, has lost 50 micrograms, so scientists are looking for a new way of defining the kilogram, perhaps as a certain number of molecules of an element. They’re probably afraid they’ll look fat next to a slimmer, trimmer kilogram at parties.