Free Rice

Have you been to freerice.org?

If it was only an S.A.T. prep, vocabulary review, chemistry review, basic math review, painting identification review, and some foreign language review site, it'd be great.

But it does one better!

For every question you get right, 10 grains of rice are donated the United Nations World Food Program. It was founded in October 2007 by John Breen. Then, in March 2009 Mr. Breen donated the site to the UN World Food Program. You get the benefit of homework help/test prep, while knowing that, with very little effort, you're helping to feed someone who can't afford to be fed otherwise.

Good grades + Good deed + Hardly any effort = YAY.