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#Mon Aug 09 12:00:46 CEST 2010
Text__2wKXUKOcEd-WfYQ0GneCwQ_text=<p>By coincidence Wilhelm Conrad R\u00F6ntgen discovers in 1895 that when cathode rays collide with metal at a high speed, previously unknown, invisible rays are generated. These rays are similar to light, but can penetrate opaque materials. The discovery soon finds application in the fields of medicine and materials testing.</p>
Text__2wKXUKOcEd-WfYQ0GneCwQ_title=X-Ray Tube