I'm really sorry for the title, It's a huge exaggeration, but I needed something to draw people's attention. 

I stumbled upon this site that many of you might already know of, it's called Free Rice, and I thought everyone should know about this.

What the site does is it gives you multiple choice questions and for every right answer you give they donate 10 grains of rice to countries that are affected by hunger. 

It's free and you have a variety of subjects to chose from such as: vocabulary, grammar, math, geography, science, language learning, art, literature and other interesting things. So it's also helping you improve your skills in a fun way. 

I'm really bad at explaining things, but go check it out.

www.freerice.com