The earth is round, so why don't some people hang upside down? The answer is gravity! With ageappropriate critical thinking questions and carefully leveled text,...
Do you ever wonder what makes a star shine? Discover how stars work, with vibrant photos and carefully leveled text that will capture the reader's...
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The earth is round, so why don't some people hang upside down? The answer is gravity! With ageappropriate critical thinking questions and carefully leveled text,...
