It's a Quiz and a Donation -- at the same time.

I recently found the site FreeRice thanks to Love It A Lot.

It's a vocabulary quiz and each time you get a word right, they donate ten grains of rice to the UN. So it's a really good thing to be doing. Plus, you learn the meaning of lots of words. It rates your vocabulary, in comparison with others who've taken the quizzes.

The highest I can get is 48/50 (and I can never manage to stay there), but I am persevering...