Timeline Wednesday 27 September 1905

Events on Wednesday 27 September 1905 1

• 1905 E = mc squared Mass and energy are the same thing A three-page afterthought to the relativity paper asked whether a body's inertia depends on its energy content, and concluded that it does. The equation itself appeared in that form only later. It became the most recognised formula in science and, forty years on, the one he most regretted.