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SDD=BOPS=ChildTeen8-10 years11- 13 Years0.0|9.9910.0|20.05 stars4 stars & up3 stars & upCrispin BoyerEvan Johnson-RansomJerry PallottaJon ChadMK ReedNational GeographicNational Geographic KidsNeil deGrasse TysonPublisherScholasticStacy McAnulty