For all the strides Title IX helped women make in sports, it’s never been a more contentious time for who gets to compete as a woman. In Part 4 of the documentary “37 Words,” filmmaker Clare Marash met transgender kids whose right to participate in society as themselves is in question by dozens of state legislatures — on the field and in life. And in our final episode to mark 50 years since Title IX became law, host Allison Glock and Clare Marash look at the future of civil rights around education and sports through families fighting for their kids to play.

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