T he sky isn't just blue by chance. I t takes all the colors of the rainbow for us to see it that way. I t happens because of something called the Rayleigh effect, or Rayleigh scattering ...

The NWS defines a rainbow as follows: A luminous arc featuring all colors of the visible ... Secondary rainbows are fainter, and the order of the color is reversed, with red on the bottom.

April 3 is Find a Rainbow Day. The seven bands of colors, lumped together as Roy G Biv, is a bridge from heaven to earth. We attach various meanings to the rain ...