“Let me show you my notebook where I wrote the algorithm. An algorithm is like a recipe,” Leila, one of the students in the class, explained to the school official who described the scene to me. You might assume these were gifted students at an elite school. Instead they were 7-year-olds, second graders in the Union Public Schools district in the eastern part of Tulsa, Okla., where more than a third of the students are Latino, many of them English language learners, and 70 percent receive free or reduced-price lunch. From kindergarten through high school, they get a state-of-the-art education in science, technology, engineering and math, the STEM subjects.