Imagine if schools suffered the same problems wrought by early start times—stunted learning and worsening health—but the cause was an airborne virus that was infecting classrooms. Parents would march to the schoolhouse to demand action and quarantine their children at home until the problem was solved. Every school district would snap into action. Now imagine if we could eradicate that virus and protect all those students with an already-known, reasonably priced, simply administered vaccine. The change would have already happened. Four out of five American school districts—more than
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