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Wind-ups
por
Illustrations and activities demonstrate springs and wind-up toys as sources of energy. Includes a plan for building a model with a wind-up mechanism, and notes for teachers and parents. Suggested level: primary.
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the long version
Illustrations and activities demonstrate springs and wind-up toys as sources of energy. Includes a plan for building a model with a wind-up mechanism, and notes for teachers and parents. Suggested level: primary.
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"Illustrations and activities demonstrate springs and wind-up toys as sources of energy. Includes a plan for building a model with a wind-up mechanism, and notes for teachers and parents. Suggested …"
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