Having discovered the existence of a new kind of rays, I of course began to investigate what they would do. ... It soon appeared from tests that the rays had penetrative power to a degree hitherto unknown. (Wilhelm Röntgen)

Having discovered the existence of a new kind of rays, I of course began to investigate what they would do. ... It soon appeared from tests that the rays had penetrative power to a degree hitherto unknown.

Wilhelm Röntgen

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begin course degree existence having kind power unknown

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