Randal Monroe is the creator of the web comic xkcd (If you have problems understanding his comics you can always consult Explain XKCD). He also has a site called What If?, which gives serious scientific answers to absurd hypothetical questions. He's worth checking in on once in a while. This one, about what a rainbow would look like on Earth if the Earth had two suns (a binary star system) like on Tatooine, is one of my favorites. Kind of links up to my essay on polar bears, if you can believe it. That diary is an old one on Kos, and the images have been lost with the failure of me keeping up with my image hosting on the site ImageShack.