This is a great website that has two awesome benefits. My girls told me they use this site in their math class and it's a great tool.
1. FreeRice.com has a variety of questions you answer in a variety of subjects--so the first benefit is you are testing your brain and gaining knowledge.
2. For every answer you get right, they donate 10 grains of rice to those in need worldwide.
This program comes with accolades from many reliable news and government sources, so I believe it's legit.
In either case it's a great way to teach kids about new subjects, and more importantly how easy it can be to help others. Great concept!!