Have you ever wondered what E=mc2 actually means? Well, now – by a miracle of time travel only he could explain – you can ask the genius who formulated this famous equation. His patient, down-to-earth answers will make everything amazingly clear.

“How would you sum up your 'special theory of relativity'?

Briefly, relativity extended the work of Newton, and in doing so it changed our view of time and space. For Newton, time passes at the same rate for all observers, regardless of the way they move. Newtonian space is the stage upon which things happen, and it never changes. According to relativity, space and time aren't fixed, they change when observers move, while the speed of light stays the same. It's the constancy of the speed of light that causes time and space to change. It's in this sense that time and space are relative.”