Exercise your brain, build your vocabulary, and send free rice to hungry people!

This concept was a great one from the get go. http://www.freerice.com allows you to donate rice to hungry people, by testing your vocabulary knowledge and building it up. A word is presented to you, with about 4 possible definitions. You click on the definition you believe is the correct one. For every word you get correct, the site donates 20 grains of rice through the United Nations World Food Program.