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Wilhelm Conrad Roentgen was the first person to discover and actually test this thing he discovered called x rays in 1895.
X-rays have smaller wavelengths and therefore higher energy than ultraviolet waves.
These are some X-ray definitions that i got from websterdictionary.com: any of the electromagnetic radiations that have an extremely short wavelength of less than 100 angstroms and have the properties of penetrating various thicknesses of all solids, of producing secondary radiations by impinging on material bodies, and of acting on photographic films and plates as light does 2 : a photograph obtained by use of X-rays.
![images[8]](http://im.glogster.com/media/1/4/35/63/4356384.jpg "images[8]")