When education reporter Kristina Rizga first swept through the double doors at San Francisco’s Mission High School in 2009, she fully expected to see the telltale signs of failure and despair. After all, three-quarters of its students came from poor families, and 38 percent were English language learners from more than 40 countries. They had posted some of the worst test scores in the nation, making Mission High a prime candidate for major restructuring or even closure. But Rizga discovered something entirely different. Despite these great odds, the students were not only learning, but thriving.