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There are countless websites out there that are geared to make you smarter and more brilliant for either a low or no cost. Here are just 25 killer websites.
Some great sites, including: Khan Academy, Duolingo, Cooking for Engineers, The Dating Specialist, Nerd Fitness, NIT Open Courseware, Investopedia, Quora, Information is Beautiful, Spreeder, Project Gutenberg, Codeacademy, Geography IQ, Anki, Lumosity, Cliffs Notes, TED, Pinfruit, Mindtools, Learn Street, HowStuffWorks, OneLook, The World Factbook, and CouchSurfing.
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