By Joe McDonald (The Athletic)

Brad Stevens had some advice for Bruce Cassidy.

The Celtics coach recommended the book “The Teenage Brain: A Neuroscientist’s Survival Guide to Raising Adolescents and Young Adults” to his Bruins counterpart, not because Cassidy is a father but because he believed it would help the Bruins boss relate to his players.

Cassidy’s immediate thought: “There’s a book I need to read.”

So, he did. Cassidy digested page after page of the New York Times bestseller.

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