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 ...
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