Tredyffrin/Easttown in Chester County is one of Pennsylvania’s top-rated school districts. But a group of parents says their kids struggle to read because they have dyslexia. And they’re pushing the district for a curriculum that’s more focused on phonics. This local parent rebellion is part of a growing national debate over how to teach children to read. On today’s episode of The Why, WHYY education reporter Avi Wolfman-Arent explains what’s at stake in this debate, and why mastering reading at an early age is crucial to future success.