Learn, fight hunger, kill time all at once at FreeRice.com – USATODAY.com

I’ll let this one speak for itself:

Feeling guilty about wasting time at work on computer solitaire? Join the growing guilt-free multitude at FreeRice.com, an online game with redeeming social value.

The game presents a word and four choices of definition. Pick right, and the cash equivalent of 20 grains of rice is donated by site advertisers to the U.N.’s World Food Program.

That’s worth a field trip to freerice.com–and don’t limit yourself to just one trip!