The self-betterment in Free Rice comes from vocabulary identification questions that automatically adjust to your skills so they're challenging but not impossible. The world-improvement comes from the eponymous free rice, ten grains of which are donated through the UN's World Food Program and the site's advertisers for each right answer you provide. In the past month, over 856 million grains of rice have been donated, with the total rising exponentially day over day.
We love the idea, and think this model has potential for all sorts of games. Every Halo headshot can net a donation to Amnesty international (sponsored by Mountain Dew). Every five star Guitar Hero performance could give money to Save the Music (sponsored by VH1, of course). Bill Gates could add few bucks to his foundation for every Achievement point earned. The possibilities are endless.
[Via Gene. Thanks Michelle]