I can't get the video enclosure things to work so I'll just give links. This is the BBC programme Horizon, and the topic is "What is Reality". Very thought provoking. (It's in four parts, arranged from 1 to 4):
http://www.youtube.com/watch?v=PTjUqI6W3yQ
http://www.youtube.com/watch?v=GXNIfxcVsJ4
http://www.youtube.com/watch?v=_QJxnaT-MlE
http://www.youtube.com/watch?v=2AuxyzKZoTA
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