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Globe-trekking flat friend goes digital on this very social app
Grades
2–6
Price
Free
Platforms
iPad, iPhone, iPod Touch
Aliens make presidential facts out-of-this-world fun
3–8
Paid
Drill math skills with basic, customizable chalkboard-style app
K–8
Friendly edu-site's cool word games could use a few more challenges
K–4
Web
