发表于2024-09-12
Machines 2024 pdf epub mobi 电子书
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What is a first-class lever and the advantage in using one? How does a windmill work? Are human beings machines? Children will learn the answers to these questions and more by conducting safe experiments using materials found in the home. A fun-filled and educational way to explore science including ideas for further experimentation and hints on turning experiments into science fair projects. Illustrated.
Machines 2024 pdf epub mobi 电子书