#1!
THIS is my favorite new thing in the world and may be becoming an addiction very rapidly just as
windexneenja predicted. But really, how awesome is it? You get to learn obscure words, test your own vocabulary (I got to level 48 but then I had to go & actually do some stuff), and help people: for every word you define correctly, they donate 10 grains of rice. So, basically, you can donate three bowls of food in about ten minutes.
#2: Look at the icon & you can probably guess my second point. If you just tuned in, my favorite explanation so far is
Ed Bernero's (Of Criminal Minds).
#3: Fun + not being a douche FTW!