In terms of understanding history and how the world changes, the most impactful programs I ever saw were two series put together by James Burke...
the original 10 part series Connections
And the followup series, The Day The Universe Changed
These programs completely revolutionized the way I look at history, innovation, science and change.
It is hard to find the full 50 minute long episodes online... but if you get the chance to see them... they are amazing. http://video.google.com/videoplay?do...q=connections# http://video.google.com/videosearch?...emb=0&start=10