CHANDLER, Ariz.–(BUSINESS WIRE)–Twenty-five years ago, an online public school in Arizona was an untested idea. Broadband was scarce, “virtual classroom” was not yet a phrase most families had heard, and the students who could not make a traditional bell schedule work had few places to go. Primavera Online School opened its doors on Sept. 10, 2001, with 35 students. Today, the tuition-free public charter school has educated more than 350,000 Arizona students in grades K-12, nearly all of them