"ADD--does that stand for awfully dumb ditz?" The bully's words sting. Kristal has attention deficit disorder. It's true she'd rather draw, daydream, and create fantasy worlds in the forest behind her house. Tad, her twin brother, has autism and is obsessed with repeating meaningless numbers over and over. The bully calls him an alien. Kristal and Tad are different from their peers, but their challenges have only brought them closer. Until...