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12:44 PM | January 13, 2013
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How do you measure mass with high precision? This is not an easy question, as it is very difficult to measure the weight of something with the same ultra-high precision with which atomic clocks measure time. To this day, the kilogram is defined by a piece of metal made of platinum and iridium that is stored in Paris. [...]

Lan, S., Kuan, P., Estey, B., English, D., Brown, J., Hohensee, M. & Muller, H. (2013). A Clock Directly Linking Time to a Particle's Mass, Science, DOI:

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