How Machinges and Tools Help Us
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A young boy who is helping his father build a barbecue pit observes that the use of a wheelbarrow and a board makes their work easier, and learns that various types of tools and machines, such as pulleys, windmills, water wheels, and steam, Diesel, and gasoline engines, all help to make man's work easier. Educational Collaborator, Helen Heffernan.
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Original permalink · Record added 2024-04-22 14:27:18