A Good Way to Fight for a Good Cause
http://freerice.com/#/english-vocabulary/1480
This is a website known as Free Rice, where they combat world hunger and promote education at the same time.
On Free Rice, every question you ask earns ten grains of rice. It doesn't sound like much, but it grows fast. It asks questions about any basic school subject. (The ones I've checked out are math and vocabulary) It starts out easy, and progressively gets harder. There are sixty levels (I'm not really sure how they break up the levels, I was on level 28 with 1,100 grains last I checked.) They have a system set up to make accounts, but it's not required to answer questions. Overall, I think it's a good website with a good cause, and I think you guys should check it out! You might learn something (I sure have)!