Make online libraries, review books, and read the classics.
Fans can fight real-world evil with social-activism site.
Up-to-date STEM stories could inspire budding scientists.
Student-created flashcards are a mixed bag.
Complex math concepts presented as real-world examples.
Great way for kids to learn critical thinking.
Shopping- and chatting-centric tween virtual world.
PBS puts preschool shows online. (Take that, Hulu.)
Peace Corps Challenge fosters understanding and compassion.