FreeRice
About 25,000 people die each day from hunger or hunger-related causes, most of them children. FreeRice provides an opportunity to improve your English vocabulary while at the same time providing rice to hungry people worldwide.

Here is how it works. When you play the vocabulary game, advertisements appear on the bottom of your screen. The money generated by these advertisements is then used to purchase the rice you have earned. Somewhere in the world, a person is eating rice that you helped provide.