Katie Maggs of London's Science Museum and Liz Parvin of the Open University discuss how a German physicist called Wilhelm Roentgen stumbled upon a completely unknown form of electromagnetic radiation in 1895 … and why they believe the X-ray machine was such a worthy winner of the museum's 20th Century Icons public vote. Few discoveries can have brought such far-reaching benefits for humanity as X-rays, not just in medicine but also molecular biology, materials and astronomy. The device on display at the museum was built by Russell Reynolds in the UK just months after Roentgen's discovery
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