Khan Academy
Provides free online courses and standardized test preparation (including for the SAT and MCAT)

 

 

How Stuff Works and Stuff of Genius
Articles and videos on the how everyday things were invented and how they work

How Stuff Works Articles 

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Stuff of Genius Videos

 

 

 

 

7 Facts
Videos that give seven cool facts about nations and regions around the world

 

For more, click here for NerdSwag247 's Globe Trot

 

Coursera
Free and paid online courses and certificates from a variety of colleges and organizations such as Stanford University, Johns Hopkins, University of Michigan and more

 

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wiseGEEK

Gives answers to common questions about a wide range of topics

 

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EHow

Advice and instructions on do-it-yourself projects and crafts

 

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Sciencing

User friendly info on all things science

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For more, click here for NerdSwag247's Mad Science