Whenintime.com. WhoWhatWhen - Interactive Historical Timelines. World History TimeMap. World History. Arab spring: an interactive timeline of Middle East protests ... On This Day. This Day in History — History.com — What Happened Today in ... On this day in 1895, physicist Wilhelm Conrad Rontgen (1845-1923) becomes the first person to observe X-rays, a significant scientific advancement that would ultimately benefit a variety of fields, most of all medicine, by making the invisible visible.
Rontgen's discovery occurred accidentally in his Wurzburg, Germany, lab, where he was testing whether cathode rays could pass through glass when he noticed a glow coming from a nearby chemically coated screen. He dubbed the rays that caused this glow X-rays because of their unknown nature. X-rays are electromagnetic energy waves that act similarly to light rays, but at wavelengths approximately 1,000 times shorter than those of light. Rontgen holed up in his lab and conducted a series of experiments to better understand his discovery. Create Beautiful Timelines. THIS DAY. History World - Timeline Search. Dipity. Create timelines, share them on the web. ConflictHistory. Preceden - The Easiest Way to Make a Timeline.