I have been experimenting on freerice.com and it is a very fun website.  Every time you answer a question correctly, you donate 10 grains of rice. I have been playing on it, and so far, I have donated 1,000 grains of rice.  The rice is donated to people who can’t feed themselves or their family.  It also teaches you things when you are having fun such as Spanish, German, Italian, Latin, French, Pre-Algebra, multiplication, world hunger, famous paintings, human anatomy, landmarks, capitals, countries, flags, literature, famous quotes, vocabulary, grammar, and chemical symbols.  I would recommend playing because it is enjoyable and it helps families that can’t feed themselves.