"Nate Bargatze used to be a genius. That is, until the summer after seventh grade when he slipped, fell off a cliff, hit his head on a rock, and "my brain got, like, dented or something." Before this accident, he dreamed of being "an electric engineer, or a brain doctor, or maybe a math person who does like, math things for a living." Afterwards, a voice in his head told him, "It's okay. You're dumb now. All you got is standup."* But the "math things"...