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http://ubu.artmob.ca/sound/russell_bertrand/Russell-Bertrand_Relativity_05-Space-Time.mp3
http://ubu.artmob.ca/sound/russell_bertrand/Russell-Bertrand_Relativity_06-The-Special-Theory-of-Relativity.mp3
http://ubu.artmob.ca/sound/russell_bertrand/Russell-Bertrand_Relativity_07-Intervals-in-Space-Time.mp3
http://ubu.artmob.ca/sound/russell_bertrand/Russell-Bertrand_Relativity_04-Clocks-and-Foot-Rules.mp3