I've got two great sites for you to check out on the web.
1. freerice.com
What a concept! Improve your vocabulary while "earning" grains of rice for distribution to needy people. There are levels of vocabulary to achieve. I occasionally get to level 48 then my memory goes! Try it, its fun.
2. galaxyzoo.com
Here's your chance to be a citizen scientist. Take the mini tutorial, learn how to classify galaxies, and pass the test. Next thing you know you're viewing pictures of galaxies that will amaze you. Worth the effort to get yourself enrolled.
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