Free Rice and...a prize?

Some of you may have heard of this site http://freerice.com/ for those of you who have not it's a charity site that donates rice to the world food program. This is done by asking visitors to the site the definitions of certain words. Each correct answer donates 10 grains of rice to the program. Now you can register as a user and accumulate a total number of grains of rice donated. I may create a contest out of this involving a certain site called we love fine for the person who can donate the greatest amount of rice. Hrm...thinking
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