noticed crystals glowing unexpectedly noticed crystals glowing unexpectedly noticed crystals glowing unexpectedly noticed crystals glowing unexpectedly History of Radiography noticed crystals glowing unexpectedly had been discovered the x-ray X-rays are measured noticed crystals glowing unexpectedly el original noticed crystals glowing unexpectedly noticed crystals glowing unexpectedly noticed crystals glowing unexpectedly noticed crystals glowing unexpectedly X-Rays