Lilly laughed softly at the resulting splash. "Not quite," she said picking up another stone. "Throw it lower, closer to the water. And make sure you throw it sidearm." She demonstrated by moving her arm in an arc, slower than she would if she were really going to throw it.

"And, when you do let go, snap your wrist, so the rock has some spin to it." Again she demonstrated the wrist movements.

"And that's all there is to it." She threw her second rock and counted out five skips before it sank.