It's the week before Christmas, when charities are sending out more requests for help and you probably don't feel like working. Alleviate both issues with this website freerice.com.
I heard about it on NPR this morning and I've already killed a few too many minutes doing "research." (The highest level I've made it to so far is 41 out of 50.) The website is set up as a vocabulary quiz. For every question you get right, they donate 20 grains of rice to a UN World Food Program. Have fun.