Found this new awesome site that donates 10 grains of rice for every question you answer correctly. They have different subjects, like Math, English, and Languages. So, not only will you possibly be learning something, you will be helping to end world hunger. This site works through the United Nations World Food Programme to help donate this rice to nations and individuals who are less fortunate then we are.
So, please go play some, learn some, and help end world hunger!
Again, the website is Freerice.com!