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    • Societies and Academies - Nature

      Nature· 3 days ago

      The investigation is on the basis of the electromagnetic theory of light, the transparent sphere being supposed to have a dielectric constant different from that of the surrounding ...

    • Change in the Colour of Moss Agate - Nature

      Nature· 3 days ago

      A FRIEND of mine possesses a penholder the handle of which is made of moss agate. Originally the colour of the handle was bluish throughout, but recently the upper part of the handle has become ...