E=mc²

I've just finished reading a book by David Bodanis E=mc².
It describes how the terms "mass" and "energy" were first used and by whom, how Einstein "designed" his theory, how the equation describes movement of the energy into mass and mass into energy and how this equation was important when developing the first A bomb. Germans came very close during the second world war to the A bomb. I hate to imagine how the world would look like if they had it first.
I like the book because of the way it introduces sientific terms and data to the public.
I recommend reading it. :)
Now my next project is reading a book about the String theory. It is said that this book is also written in a very way everyone can understand it. I'll see.