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iBooks (free)
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Kindle (free)
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Brainpop (free)
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This Day (free)
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Library of Congress (free)
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Merriam Webster Dictionary (free)
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Discovery Mobile App for Education Webclip (free)
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The Elements ($13.99)
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Wolfram Alpha ($1.99)
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Google Earth (free)
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Biblion (free)

Britannica Concise
Guiness Book
Epicurious
How Stuff Works
National Geographic
StarWalk
TED
Wikipanion
World Atlas
Mashable