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POPSGreat science books for little kids, from HarperChildrens This is an excellent series. Short, easy-to-read, beautifully illustrated books on simple science topics -- like bugs, seeds, storms, seasons, sleep, and teeth -- written in engaging language that children can both understand AND learn real scientific facts from. Two levels of difficulty: stage 1 is for pre-K to K-age children; stage 2 is for kids in primary grades.