Did you know that in the U.S. we generally count seven colors in a rainbow whereas elsewhere in the world people only count five? We all see the same rainbows but it can be tricky to count the colors ...

QUESTION: What exactly are rainbows? ANSWER: My second-favorite Muppet, Kermit the frog, tells us that rainbows are visions, but only illusions. I’ll try to explain what a rainbow is, and you can ...