It’s fiendishly simple: the screen presents the viewer with a vocabulary question. Click on the correct answer and FREE RICE donates ten grains of rice to the UN World Food Program. A graphic on the side shows bowls of rice as they fill and accumulate. That’s it. Except that now there’s another word on the screen, a harder word, so you click on the definition for that one and watch as the score improves. By the time the participant checks out the other topics available — geography, French, multiplication tables — dozens of words have been defined and multiple bowls full of rice have been donated.