Time Waster with a Charitable Bent
 

If you go to www.freerice.com you can participate in a game where you attempt to pick the correct definition for a word from a list of 4 choices. For every word you get correct 10 grains of rice are donated to a UN Food program. There is, however, also the game component. After giving 3 initial words to set your base level, for every 3 words you get correct you move up a level, from 1-50. For every word you get wrong you move down a level. The highest I've gotten is 44, with me typically hovering in the 39-41 range.