Rainbows: Nature's Ephemeral Illusions (Slideshow)
Image credit: Nicholas_T/Flickr
If you follow a rainbow to its end, the story goes, you will be rewarded with a leprechaun's hidden pot of gold. Though a more natural path could not be imagined, following such a multicolored-arc to its source may prove to be impossible.
With climate change already increasing and decreasing precipitation around the world, rainbows may be much more common in some places and far rarer in others.