For 50 years, “Sesame Street” has been advocating for school readiness, bringing the building blocks of learning to generations of children. Today, the organization continues to focus on the ABCs as well as empathy and community, broadening the reach far beyond the relatively new medium of television where it began. Peabody awarded that first season of “Sesame Street,” and now a half-century later again acknowledges the consistent excellence in children’s programming.