"Why are there so many songs about rainbows?" sings Kermit the Frog in a song (about rainbows) called "Rainbow Connection" from 1979's "The Muppet Movie." And it's not just songs that feature rainbows ...

The Midway Geyser Basin's Grand Prismatic Spring is the largest hot ... 370 feet in size and around 121 feet deep, its rainbow waters are what really make it fascinating. While the center of ...