There is nothing more beautiful in the sky than a colorful rainbow after a storm. Sometimes we catch just a glimpse and other times the colors are vivid and bright. It can be hard to tell exactly how ...

A basic rainbow streaks across the sky in Oregon Raceway Park in Grass Valley, Oregon. Curt Smith via Flickr, CC-BY-2.0 Though not a rainbow, these iridescent clouds are a similar visual treat. sandid ...

Hummingbirds are some of the most brightly-colored things in the entire world. Their iridescent feathers reflect light in a way that other birds can't match, and scientists weren't sure what made ...

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 ...