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While building a soapbox racing car, a pair of friends provide an easy-to-understand lesson in how simple machines are all around us, making our work more efficient. Michael and Luci show readers that a broom is a lever, nails are wedges, and a screwdriver is both a lever and a wheel and axle. The two also prove that curious children can be just like scientists, making observations and using how and what questions to explore physical science principles they encounter all the time. "Michael s Racing Machine" is part of the I Wonder Why book series, written to ignite the curiosity of children...

Take a world tour between the covers of a book "Environments of Our Earth" guides children through six types of regions that are shaped by rainfall or the lack thereof. Readers take a journey that starts with dense tropical rainforests and woodlands, travels through grassy savannas and prairies, and ends at dry steppes and deserts. Throughout the book, attentive readers can compare how and why each region is alike and different. They will also discover fun facts about the wettest and driest places on Earth and the amazing effect rainfall has on plants, animals, and people. "Environments of...