You might notice that I added a link to the right, called Free Rice. This is a link to a site that allows you to improve your vocabulary (not just in English) AND feed the hungry. For each answer you get right, the site will donate 20 grains of rice. That doesn't sound like a lot, but trust me, it's addicting! The total donations listed on the site are 45,782,034,850 since 2007.
I would also like to point out this video telling a bit about Free Rice and showing the rice getting delivered to Bangladesh with help from the United Nations World Food Program.