Mmmmmmm.... Rice......

So, you think you're a smartypants.
And you're not a fan of world hunger.

Boy, have I found the website for you: Free Rice.

Think of it as the vocabulary portion of the SAT-- except for each correct answer, instead of getting into a better college, you donate rice to an impoverished nation. Ok-- so it's only ten grains of rice per vocabulary word. But hopefully, you're smart enough get more than just one definition right.