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What Makes Day and Night Accompanied by NASA photos and Dorros colorful drawings Branleys textexplains the Earths rotation in clear and simple terms. An experiment using alamp as the... »
Gravity Is a Mystery What goes up must come down. Everybody knows that. But what is it thatpulls everything from rocks to rockets toward the center of the earth? Itsgravity. Nob... »
What Makes a Magnet? Will a magnet pick up a paper clip or a feather? In this book veteran authorFranklyn Branley explains the properties and behavior of magnets. The charmingill... »