25 Sites We Can't Live Without

From Amazon and Google to Craigslist and Wikipedia, here are the sites that we keep bookmarked year after year

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There's a ton of great content here — about animals, world adventures, the environment, the sciences, space — plus educational stuff too. Also check out National Geographic's My Wonderful World, which aims to boost your geographic literacy, offering daily quizzes to test your global IQ — and be sure to see the special section for Kids & Teens.

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