The beginning of the 20th century heralded a scientific revolution: what a few brilliant minds uncovered about our reality in the first twenty years has shaped the history of our species. & one of them in particular stands out: Einstein, with his celebrated E=mc 2. In this remarkable & insightful book, Christophe Galfard describes how E=mc 2 is a direct consequence of the Theory of Special Relativity, the theory of how objects move & behave, at speeds close to the speed of light. He considers Einstein`s legacy in the light of the 21st century, with fresh hindsight, & considers its impact on our vision of reality. The reader will discover that far from being just a formula, it is a brand new understanding of the nature of space & time. Some of the greatest scientific breakthroughs in the history of science have been made by geniuses who managed to merge & unite hitherto separated domains of knowledge. Galfard explores two unifications with Einstein`s theories, & looks at the even bigger picture of how E=mc 2 has changed our world, & what it entails for the future. Throughout, Galfard takes the reader on an extremely entertaining journey, using simple, jargon-free language to help the reader gain a deeper understanding of science. With humour & patience, he guides us through the world of particles, anti-matter & much more to bring us closer to an ultimate understanding of reality as we understand it today.