Poet Laureate Joy Harjo says she loved poetry as a kid, but didn't feel like it belonged to her. "It wasn't until I heard Native poets," she tells NPR's Michel Martin, "that I realized that, wow, this is a powerful tool of understanding and affirmation. And I don't know, I just started writing." Harjo had been studying medicine, she says, and she knew her people needed doctors — but what about poets? Her new memoir Poet Warrior is a chronicle of pain and injustice, of growing up poor with an abusive stepfather — but also of poetry and discovery, of taking that pain and using it to make art.