After Krista Rickards’ daughter Sarah suffered a severe concussion on a high school volleyball court in September 2010, the teenager returned to school in a matter of days. Sarah looked just fine. But she quickly became a regular at the school nurse’s office, complaining of dizziness and severe headaches triggered by the noise and chaos of the halls and lunchroom, by overhead projections used in classrooms, and by long days and nights of books and homework.

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