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FreeRice.com is a site on which you can make a small difference in helping the poor by developing your vocabulary skills. What you do is simply click on the correct meaning of a given word. As you keep doing that, three advertisements display on the bottom of the site which pay for the rice. Every correct answer means 10 grains of rice.

This is one of the most ingenious and brilliant models of raising funds I have seen! Advertisers pay for impressions and users are the ones who make them by visiting and keeping on playing the vocabulary game. In the end this apparently means that roughly each time you make a correct answer you earn the site enough money to buy 10 grains of rice.

Here is a nice way to contribute to Free Software projects that you like and use frequently, and get a bit of promotion for your blog in return.