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EntertainmentThe method of replacing the standard platinum one kilogram weight
The inconvenience in using the one kilogram international standard weight scale IPK forces scientists to find other ways to measure.The standard weight has increased
The standard calibration weight of the kilogram unit should be measured
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Can carp live 10 years in a tank without feeding?
Why do Italy and Switzerland have to redraw the border?
Japanese bullet train accident-free for 60 years
The world's most crowded apartment building: Can accommodate up to 30,000 people, the view inside is overwhelming
World's oldest wine jar contains cremated human bones
America catches strange signal from 1.3 billion light years away from Earth
Two black holes closest to Earth discovered, of a kind never seen before
Solar sails help spacecraft reach Mars in 26 days
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