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Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.
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Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.
Seguir leyendoA simple biography of the naturalist who founded the Sierra Club and was influential in establishing the national park system.
Seguir leyendoDefines wheels, explains their functions, and suggests simple experiments to demonstrate how they work.
Seguir leyendoFollows the life and career of the French scientist who proved the existence of germs and their connection with diseases.
Seguir leyendoDefine planos inclinados, explica sus funciones, y sugiere experimentos sencillos para demostrar cómo funcionan.
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