[[http://www.bbc.co.uk/iplayer/episode/b00fyl5z/Horizon_Do_You_Know_What_Time_It_Is/ I recorded this programme for ds1, as Professor Brian Cox is his hero, and we watched it together yesterday.
ds1 is fascinated by this stuff; admittedly I did nod off at one point so wasn't exactly concentrating on the logic, but basically I didn't understand very much of it at all!
Should I watch it again to see if I can follow it, or should I give up now?