Alright, smarty-pants," she joked, pushing her fringe back with mock exasperation, leaving a few strands sticking out at adorable angles. Elsa's heart jumped again. She fiddled with cord of her headphones, trying to distract herself, frowning slightly when she saw her sister narrowing her eyes."Or maybe you found it easy because you gave yourself a little advantage," the girl remarked, winking.Elsa furrowed her brow. "Advantage?" she questioned. "What-"Anna waggled a finger at the webcam. "I see those numbers on your hand," she teased. "What is that? Is that like, Einstein's constant or something?