Spend a few minutes at Freerice.com next time you're about to start a new Sudoku

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ImageRice prices keep going up, but freerice.com allows anyone to donate rice by playing a simple vocabulary game: You just make a guess at what a particular word means, and... if you get it right, you've just donated 20 grains of rice to be distributed through the UN World Food Program.

And the site wants you to get it right as often as possible, so based on your results, it automatically adjusts your level of vocabulary and you get words it expects you to know. The rice is paid for by the advertisers on the site.

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