he said the fraternity was diverse, and the racist chant is not part of the frat's tradition. >> when i was here i had no knowledge of the existence of that chant. >> reporter: you never heard it? >> i never heard it. i never read it. i did not know it existed. i want to set the record straight that this is not something that has been ongoing in this chapter for many years. >> reporter: cnn, norman oklahoma. you now activists in london fight to keep teens from joining extremist groups like isis. coming up why they say their job seems to get harder by the day. plus how the written words of the boston marathon suspect are being used against him coming up. the star of a hit show is suspended by a british broadcaster for an altercation with the producer. when it comes to medicare, everyone talks about what happens when you turn sixty-five. but, really, it's what you do before that counts. see, medicare doesn't cover everything. only about eighty percent of part b medical costs. the rest is on you.