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"Move forward." Xavier is 4-years-old, and he is holding a tiny tile with an arrow on it. We are playing the robot-powered coding game, Matatalab, and I've just asked him what he thinks the tile means. Granted, I had prompted him generously. Xavier's teacher, Ms. Owens, approaches curiously from across the room. "Did he speak?" she whispers. "Xavier doesn't speak that often."
