If the hand be held between the discharge-tube and the screen, the darker shadow of the bones is seen within the slightly dark shadow-image of the hand itself... For brevity's sake I shall use the expression 'rays'; and to distinguish them from others of this name I shall call them 'X-rays'.
Wilhelm Conrad Röntgen
discovery, electromagnetism, light, nobel-laureate, nobel-prize, physics, science, x-rays