Even though i am a Radiologist with keen interest in History, i never knew this X-Rays may have been produced more than a century before Roengten!!
"In 1895, Wilhelm Conrad Roentgen's discovery of x-rays in this laboratory revolutionized science and medicine but did you know that x-rays may have been produced by William Morgan, a Welsh mathematician, more than a century before Roentgen's discovery?
In 1785, Morgan was conducting experiments on electrical discharges in a vacuum when he noted that "according to the length of time during which the mercury was boiled, the 'electric' light turned violet, then purple, then a beautiful green...and then the light became invisible." Morgan's experiment was witnessed by American diplomat Benjamin Franklin, a fellow investigator in electrical phenomena."
Reference-The Roentgen Centennial