bill cosby and psychiatrist alvin pouissant take on the ills of black america. that's up next. >> i can look people in the face and hear somebody tell me to my face, well, you didn't do anything during the time of the civil rights march and the so forth and so on. and i think i feel very, very comfortable, man, looking at that person and saying, okay, well, what are you going to do about today? ♪ our world ♪ our world ♪ our world ♪ ♪ our world >> bill cosby is a comedic legend. in the 1960s he was a groundbreaking stand-up comic that had crossover appeal. he later pushed the needle by becoming the first black star in a weekly action series. the '70s gave birth to the popular cartoon "fat albert and the cosby kids." and in the 1980s, he became america's dad with the phenomenally successful "the cosby show," which showed the country a flourishing black family as never before seen on television. but cosby's latest venture has nothing to do with entertainment or comedy. since 2004, the philadelphia native has crossed the country warning the country of ills of teen p