Sweet story about a math teacher who teaches for free

"Five mornings a week, Bruce Kravets, 66, puts on a coat and tie, straps on his helmet and bikes to work at Palms Middle School on L.A.'s Westside, where he teaches math. For free.

[...] Kravets dwells unself-consciously in his own horn-rimmed universe of equations filled with Xs and Ys, his hair curled by the heat of his passion for problem-solving.

Students last week sat transfixed as Kravets scribbled on an overhead projector [...] There was no fidgeting, giggling or texting. Kravets would call on a student and ask him or her to state aloud how to solve a problem, and he would stick with that student until there was complete understanding. He told me he's always taught by the Socratic method, believing that the process is as important as the right answer."