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Double Rainbow: What Does This Mean?

Witnessing a double-rainbow in nature may seem like a mystical experience, according to the famous video shot in Yosemite where the cameraman yells out in bliss: "What does this mean!"  Discovery de-mystifies what causes a double-rainbow to look so perfect, as though out of a fantasy movie or a commercial for Lucky Charms.

      

Image credit: puuikibeach/Flickr

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