pnm://raarcabk001.broadcast.com/books/science/relativity_1.rm?StreamID=227&ru=Wget/1RUPERIOD5RUPERIOD3&s=78015243
pnm://raarcabk001.broadcast.com/books/science/relativity_2.rm?StreamID=228&ru=Wget/1RUPERIOD5RUPERIOD3&s=78015243
pnm://raarcabk001.broadcast.com/books/science/relativity_3.rm?StreamID=229&ru=Wget/1RUPERIOD5RUPERIOD3&s=78015243
pnm://raarcabk001.broadcast.com/books/science/relativity_4.rm?StreamID=230&ru=Wget/1RUPERIOD5RUPERIOD3&s=78015243
