Now here is a really interesting concept! Have a look at FreeRice:
From the site:
FreeRice has two goals:
- Provide English vocabulary to everyone for free.
- Help end world hunger by providing rice to hungry people for free.
This is made possible by the sponsors who advertise on this site.
WARNING: This game may make you smarter. It may improve your speaking, writing, thinking, grades, job performance…
Sound too good to be true? Well, it does appear to be totally legitimate. The Urban Legends Reference Pages (Snopes) supports it. You can also read about it on the United Nations World Food Programme site – the agency that is distributing the donated rice.
The vocabulary score goes up to 50, but it is apparently “rare for people to get above level 48.” You can set the site to save your score for next time in the “Options” menu. (My current level is 48, and my best so far is 49. Getting to 50 may be a challenge!)
The current total of rice grains donated is reported to be over 4½ billion.