Yes, really, and apologies for sounding a bit flippant about world hunger, it is an issue I take seriously and do care about resolving.
Check out www.freerice.com.
Its a vocabulary "quiz" and for each right answer you get, so much rice is donated. Apparently the cost of the rice is paid for by the advertising on the site ( this is all explained on the site). You also get the added benefit of improving your vocabulary--these are not easy words. It says most people do not get above a level 50, but it goes up to level 60. I think I have got to a level 46 or 48 on some day I was feeling particularly bright!
Check it out!