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2 articles in History. Show everything
The Rosetta Stone records a political decree. Its importance came from the different scripts used to write it, and the comparisons scholars could make between them.
Read article : Reading the past through the Rosetta StoneA second once depended on observations of the sky. Its modern definition fixes an atomic frequency, but building a clock that reproduces it remains an experimental problem.
Read article : The second, from the spinning Earth to the atom