Weird combination, isn't it? Here's the premise: you are given a word with 4 choices as to the word's meaning. Get the answer right, and ten grains of rice go into your bowl. The rice grains add up as you correctly answer. No rice is taken away if you answer incorrectly. The accumulated rice is donated through the United Nations World Food Program to people in need around the world. This "game" just began on October 7, 2007. At this writing, nearly one billion grains have been donated already, paid for by advertisers on the site.
So, give it a try - learn and give at the same time! And don't blame me if you get addicted to it.