So you’re sitting at your desk pretending to be hard at work, staring attentively at the screen while you put yet another jack of spades on top of the stack to complete your three hundredth game of solitaire. While you’re busy looking busy, why not do something useful?

Freerice.com helps to end world hunger and increases your vocabulary at the same time. This highly addictive site donates 10 grains of rice to the United Nations World Food Program for every word definition you get right. The words gradually get harder or easier as you get answers right or wrong, and the unobtrusive advertising on the bottom of the screen pays for the rice while you improve your vocab. Know what it means to filch something? Go to freerice.com and you could actually put that knowledge to some good use.