For those interested, there is an interesting article in the February issue of "The Scientist" describing how colors in the natural world are derived from colorless nano-structures.  Among other colorful things, they talk about how the physical structure of the feather barbs imparts that brilliant blue to the Easter Bluebird.

http://www.the-scientist.com/?articles.view/articleNo/34200/title/Color-from-Structure/


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