Simple machines
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"Thirteen experiments about simple machines - levers, wheels, axels, pullies, wedges and screws - teach kids basic science. Full-colour photographs and step-by-step instructions explain each activity, so that kids can make most of the machines with minimal help from adults" …
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"Thirteen experiments about simple machines - levers, wheels, axels, pullies, wedges and screws - teach kids basic science. Full-colour photographs and step-by-step instructions explain each activity, so that kids can make most of the machines with minimal help from adults" Cf. Our choice, 1997-1998.
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""Thirteen experiments about simple machines - levers, wheels, axels, pullies, wedges and screws - teach kids basic science. Full-colour photographs and step-by-step instructions explain each activity, so that kids can …"
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