Zeptogram Weighed

Researchers at the California Institute of Technology have created a scale that can measure up to a zeptogram (10-21g) of mass. The researchers demonstrated their scale by measuring the mass of a cluster of xenon atoms. The scale holds promise in medical and environmental science, where protein chips and mass spectrometers are used to identify molecules, but are hardly accurate. With a scale that is 1,000 times more precise as the latest -- capable of measuring up to a yoctogram (10-24g) -- accurate measurements and therefore ease of molecule identification could be accomplished.

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