Free Rice

The Free Rice website blends two excellent things: using advertising money to donate rice via the UN World Food Program - which is a GOOD THING - and a word definition game.

As it says, for each word you get right, they donate 20 grains. They could just say "endlessly refresh the page" as each click could donate, but they make it interesting, rewarding and cumulative, which is far more effective at driving endless clicking.

Build your vocabulary and harnass the awesome power of intertising to make rice appear from nowhere now.