New parents deserve the coolest baby gifts, don't they? Take a look at these adorable and useful items that will make ...

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The Bears climb a big hill to reach a book, but Melody slows them down. The others create different ways of motivating Melody to keep climbing. In the end, it is Melody who has to invent a way to get ...

School of Physics, Shandong University, 27 Shandanan Road, Jinan 250100, China ...