There’s a new kid on the block – on Sesame Street that is. In April, audiences around the country will be introduced to Julia, the show’s first new Muppet in 10 years.  And like an estimated one in every 68 American children, she has autism. Advocates are hoping she can help brake barriers like so many shows have attempted in the past.  WGBH Arts Editor Jared Bowen ( @ JaredWGBH ) and Rachel Rubin, a professor of American Studies at UMass-Boston, join Jim for a discussion on what the producers of Sesame Street might achieve with Julia.