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Rainbows come in a surprising variety of shapes and colors, and scientists like Dartmouth’s Wojciech Jarosz are discovering why this is so, reports Scientific American.

“Anything that modifies the light before it hits the water drops will impact the colors in a rainbow,” says Jarosz, an assistant professor of computer science. “If it was a particularly polluted day with a yellow sky, you would get a more yellow rainbow,” he says.

Read the full story, published 2/26/16 by Scientific American.