American schools have always been more than where we go to learn the ABCs: They're places where socialization happens and cultural norms are developed. And arguments over what those norms are and how they're communicated tend to flare up during moments of cultural anxiety — like the one we're in now.When it premiered in 1969, the kids' TV show Sesame Street was part of a larger movement to reach lower-income, less privileged and more "urban" children. It was part of LBJ's Great Society agenda. And though it was funded in part by taxpayer dollars, Sesame Street is a TV show, not a classroom, and it set out to answer the question of what it means to educate kids. Today: how a television show made to represent Harlem and the Bronx reached children across a divided country, and how the conversations on the street have changed alongside us