Its location and track record make Atlanta Public Schools a likely target of takeover by the proposed state Opportunity School District. I discuss how APS intends to combat state takeover and the problems its school chief says stand in the way. In a guest column, an Elon professor who credits “Sesame Street” with preparing her for kindergarten when she was a child worries a new deal between the beloved children’s show and HBO may further the digital divide that leaves low-income children on the losing side. And readers share their views on whether Georgia education reforms have overlooked the importance of principals in creating cultures of success.