A co-worker pointed out this site to me. FreeRice is a sister site of the world poverty site, Poverty.com. The website provides a word and several meanings. Every correct answer will gain you 10 rice, which they will donate to the United Nations World Food Program.
FreeRice has two goals:
1. Provide English vocabulary to everyone for free.
2. Help end world hunger by providing rice to hungry people for free.
This is made possible by the sponsors who advertise on their site.
Whether you are CEO of a large corporation or a street child in a poor country, improving your vocabulary can improve your life. It is a great investment in yourself.
Perhaps even greater is the investment your donated rice makes in hungry human beings, enabling them to function and be productive. Somewhere in the world, a person is eating rice that you helped provide. Thank you.