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LeapFrog LeapStart 1st Grade Activity Book: STEM (Science, Technology, Engi Battery Converters Just Eject The Damaged OneRequires LeapStart System to use. Works with all LeapStart systems (Sold Separately). Explore the way things work with the Letter Factory friends using science, technology, engineering, math and teamwork Understand tools for space study. Know characters of the sun. Explore solar system basics. 30 replayable science activities inside. Level 4: 1st grade. Perfect for ages 5 to 7.