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    • The Height of the Aurora1 - Nature

      Nature· 21 hours ago

      A GOOD story used to be told some years ago of a candidate, who, when undergoing the torture of a vivâ voce examination, was unable to reply satisfactorily to any of the questions asked. “Come ...

    • The “Night-shining Clouds” - Nature

      Nature· 21 hours ago

      On July 2, 1889, this was found to be somewhat over 80 kilometres. The question is therefore set at rest as to whether the clouds are self-luminous, for it is evident that at such a