“Before I leave the bathroom, I pinch my cheeks hard to bring blood to the surface of my skin. It’s stupid, but I don’t want to look weak and exhausted in front of everyone.When I walk back into Tobias’s room, Uriah is sprawled across the bed facedown; Christina is holding the blue sculpture above Tobias’s desk, examining it; and Lynn is poised above Uriah with a pillow, a wicked grin creeping across her face.Lynn smacks Uriah hard in the back of the head, Christina says, “Hey Tris!” and Uriah cries, “Ow! How on earth do you make a pillow hurt, Lynn?”“My exceptional strength,” she says. “Did you get smacked, Tris? One of your cheeks is bright red.”I must not have pinched the other one hard enough. “No, it’s just … my morning glow.”