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Physical therapist Michael Koch measures the range of motion in Cullen Schachtschneider's knee at Spine and Sport Physical Therapy in Waupaca, Wis., Jan. 18, 2018. Children as young as 5 are growing up driving large farm machines to help their families. Thousands, like Cullen, are injured every year; many are killed. (Alyssa Schukar/The New York Times/Fotoarena)
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