FreeRice is a sister site of the world poverty site, Poverty.com.
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.[...]
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.
So many others have already blogged about this site, but it really is a win-win situation; you get both the satisfaction of improving your word repertoire and the knowledge that you’re helping fight hunger. So, check it out.