Who was born first, Celedonio Calatayud or Wilhelm Conrad Röntgen?
Wilhelm Röntgen: Wilhelm Conrad Röntgen ( ; ] ; 27 March 1845 – 10 February 1923) was a German mechanical engineer and physicist, who, on 8 November 1895, produced and detected electromagnetic radiation in a wavelength range known as X-rays or Röntgen rays, an achievement that earned him the first Nobel Prize in Physics in 1901.
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