Thank you for posting this. Time has been an interest of mine
   since I started watching Doctor Who with my grandmother at the
   age of 8, and I'm now 43 years old and suffered through the 15
   years of "No Doctor Who" [with no hope of it ever returning] by
   filling it up with every time travel story (whether science
   fiction or science or wherever I could find it) in the interim.

   His take, from a philosophical point of view is quite good, and
   does a nice job. A bit long-winded for my taste but he was being
   thorough.

   If you want to study further, there is some EXCELLENT stuff
   here: http://sydney.edu.au/centre_for_time/