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Master optician Achim Leistner measures the roundness of a sphere; Making what is probably the roundest object in the world; Australia weighs in to make the perfect kilogram
Australian scientists and optical engineers will be making a perfect sphere that may one day re-define the kilogram - and tomorrow they're taking delivery of the cylinder of silicon from which it will be made.The kilogram is one of seven base units in the International System (SI) used in...
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