The Science of Doctor Who

Almost fifty years after he first crossed the small screen, Doctor Who remains a science fiction touchstone. His exploits are thrilling, his world is mind-boggling, and that time travel machine—known as the Tardis—is almost certainly an old-fashioned blue police box, once commonly found in London.

Paul Parsons's plain-English account of the real science behind the fantastic universe portrayed in the Doctor Who television series provides answers to such burning questions as whether a sonic s...