This is a pretty awsome website, what it does is donates 20 grains of rice for every vocab question you get right.FreeRice
If there are any mac ppl out there i made a simple automater program that will choose the bottom choice every time.
FreeRice.zip - FileFront.com
Just open it up and resize your browser, not move your browser window but resize it to mouse is on bottom choice every time
Play this while i sleep and get around 50k grains every night