Take the free rice challenge. Identify the meaning of the words provided and, thanks to sponsorship, rice gets distributed by the UN World Food Programme.
I've manage to get a vocabularly level of 45. Can you get to level 50?
You can also download an interesting game at Food-force.com that allows you to take the role of the UN World Food Programme representatives in a warzone. Find refugees, negotiate resources, balance a diet and deliver aid by air and land.