How Wilhelm Roentgen Discovered X-rays

So, why is an x-ray called an x-ray?  The short answer is that when Wilhelm Roentgen discovered x-rays in 1895, he called them x-rays outright because x stood for unknown and he knew he had found a new, previously unknown ray.  Ok, bye!  But I still haven’t answered how did Roentgen know he had discovered a new kind of light and why did the name stick outside of Germany and why do x-rays have a totally different name in German?  I’ll tell you. 

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