Few formulas are as well-known as E = mc². Everyone recognizes it, but who really understands what it means? Albert Einstein's theory of relativity is a tough nut to crack. It's easy to lose your bearings in space and time, and perhaps gravity tends to be a somewhat lighter read. But before you rush away at the speed of light from one of the most influential theories of the 20th century, wait! Thomas Bührke explains the highly complex concepts of General and Special Relativity in a clear and accessible way, using understandable examples.