On a Thursday morning in Petersburg High School's room 206, algebra II students sit around the edge of the classroom, forming a big U. Their teacher, Megan Smith, asks them if it's possible to take the square root of a negative fraction.
"Noooooooo" they chorus, "No solution!"
Together they work through a series of problems. Then, even though class is only halfway over, she tells them to get started on their homework.
She turns to four students who had been ignoring the lesson, curled over textbooks at the front of the room – working on calculus.
She teaches both classes at the same time, spli...
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