Thanks to the affable, altruistic, beneficent, etc., etc.
uninvitedcat for tipping me off to this site:
http://www.freerice.com/index.php
Test/improve your vocabulary and hand out free rice to the needy:)
The more you get right, the higher your challenge level goes. I hit 42 a few times, when the lexicon starts to get extremely medical. The levels go as high as 50, although the site claims few make it even as far as 48.
This also strikes me as excellent practice for PSATs, LSATs, GREs or anything else with a vocabulary testing component. So much so that I'm passing this post to Emily to share with her English teacher.
My only suggestion would be for them to add fried rice to the donation program. That way you'd almost have to come back an hour later and do it some more;)