Why Does E=mc²?

'Why Does E=mc²? (And Why Should We Care?)' is a 2009 book by the theoretical physicists Brian Cox and Jeff Forshaw. This was the first full-scale book from Professors Cox and Forshaw.

Overview
The book aims to provide an explanation of the theory of relativity that is accessible to a general reader. The authors tell the history of Albert Einstein's equation, E=mc², and explain what it stands for.