public television has been expected to do a great deal. almost half of all noncommercial program hours are aimed at children. and it has come to be so many thins to so many people. >> the pbs children's programming in the '70s became the platinum standard on the planet for how you use this medium to educate kids. ♪ would you be mine could you be mine won't you be my neighbor ♪ >> it was fred rogers who made it okay to speak to an audience