There are not many shows on television that deserve to be called true American institutions but one of them is surely "Sesame Street." It's been on the air now for almost 50 years. When "Sesame Street" began in 1969, it was considered an experiment.  The question: Could television be used to educate young children?  Well, research proved the answer to be yes, and the nonprofit children's television workshop -- now called Sesame Workshop -- that created the show, has been refining and expanding that mission ever since -- everything from abc's and 123's, to race, and even death. 

When we first broadcast our story this past spring, "Sesame Street" -- which now airs on HBO as well as its longtime home on PBS --  was getting ready to take on its latest challenge introducing a new kid on the street -- a Muppet named Julia, who has autism.