How the kilogram has put on weight

Monday, January 7, 2013 - 08:30 in Physics & Chemistry

Using a state-of-the-art Theta-probe XPS machine, experts in the UK have shown the original kilogram is likely to be tens of micrograms heavier than it was when the first standard was set in 1875. And they say a suntan could be the key to helping it lose weight.

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