How are rainbows formed? How about double rainbows? Are rainbows really circles? Why isn't brown on the rainbow?
... We explain like i'm five!
Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: intangible-tangerine, lastsasquatch, zanelightning, sirherald, dammitcaesar, larae_is_bored & jollyrogerninja
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