Thanks to the fine folks at CookingEatingDurham I'm now completely obsessed with Free Rice which is a vocabulary quiz that's raising money for the UN World Food Program. I'm not sure how sustainable their business model is. I mean, when I'm playing the game I'm not paying any attention to the ads on the page which is where the revenue is coming from. I guess the theory that the game and the desire to create more food contributions combine to keep people on the site longer, meaning the ads get more views. The game, like I said, is completely engrossing. At least if you're a word geek. I've actually been able to max my score out, altho it took a good while and I think I was aided a bit by words I learned from the game. Even though they state that they have a large dictionary I definitely started to see some repetition after a while. Still, it's tons o' fun.