X-rays

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Correct. Wilhelm Conrad Röntgen discovered the rays much by chance. To this day, they are known in Germany as Röntgen rays. 

In 1995, the first German woman won a Nobel prize for a scientific discovery. Christiane Nüsslein-Volhard received the award for her research on genetics. She was helped by a type of animal that can sometimes be found in German homes. 

Which animal do you think it was?

A mouse  A gecko  A fruit fly

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