Friends, family, loved ones, distant relations- there are many things that give you identity. The choices you make, the things you say, and above all the little things you do the little annoying things you do. The things that make me say "Only you are like this.” Don’t ever change.
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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/