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There are a lot of things that have improved over the past 50 years, but are still far from perfect: Car safety. Solar power uptake. Scores of medical procedures. Add reading comprehension instruction ...

COMPTON, Calif. — Math is the subject sixth grader Harmoni Knight finds hardest, but that’s changing. In-class tutors and “data chats” at her middle school in Compton, California, have made a dramatic ...