As our favorite Time Lord turns 50 this year, I started thinking back as to what Doctor Who means to me, or has meant to me over the years. Doctor Who means everything to me; it is Science Fiction, Fantasy, Horror, Drama, Historical, Comedy, and anything else you can think of. One story can show you what life was like with the Aztecs, the Romans, or during the French Revolution.  Then the next story you can be thrown into the far future facing an evil alien race like the Daleks.  The story after that might have you entrenched in a moral or ethical dilemma, or laughing out loud at your TV screen.  You never know what might be just...