Switches are marvelous things - they control the most useful and convenient form of energy in our modern world, electricity. By powering machines and devices it turns night into day, stillness into... This description may be from another edition of this product.
I bought this for our 4th grade science unit on Magnetism and Electricity. The kids like to look though it at all the pictures. . .lots of information in this large sized (but not too many pages) science book.
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