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What do ostriches and penguins have in common? In this text, kids compare and contrast facts about these two kinds of flightless birds.

The goby fish and pistol shrimp help each other out deep in the ocean. Learn about them and other symbiotic relationships in this nonfiction story.

Reach for the stars with this interactive story about the solar system that works on science and literature learning at the same time.

Work on science and reading at the same time in this digitally-savvy reading exercise that's all about our solar system.