How would you rate me on a scale of one to ten? That’s a question you should never, ever ask. Or answer, although trying to get out of it would just as likely start an argument as answering.
Asking to be rated is akin to asking if these pants make my butt look big. You don’t want honesty, you want validation. But you might get honesty instead. -via reddit
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The effect likely comes not from diffraction as seen on a CD, but from thin film wave interference. The Naked Scientist (link below) has the best, quick description that I could find. Google "Oil Rainbow Effect" to get more information.
http://www.thenakedscientists.com/HTML/questions/question/1708/