This is the neatest site. Check it out! You play the vocabulary game, and ever right answer you get, the site donates 10 grains of rice to the UN Food Programme. Who pays for the food? The advertisers at the bottom of the page! (who I didn’t even SEE, since I had my screen resoluation set so low 
) You do a little learning and earning at the same time. Pretty cool.
Now whenever I am in the mood for a little mindless computer time, instead of solitaire, I play this because you are learning and helping and relaxing all at the same time… very cool!