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Which is heavier, a pumpkin or a feather, and how can you tell which will be heavier even before you pick up these objects? You’ll find out the answers to questions like these in this book that explains what properties of different materials make something heavy or light.
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Which is heavier, a pumpkin or a feather, and how can you tell which will be heavier even before you pick up these objects? You’ll find out the answers to questions like these in this book that explains what properties of different materials make something heavy or light.