In other words, a blue sweater absorbs all of the colors in the spectrum except for blue. Kai Kupferschmidt is a science journalist and author of “Blue: In Search of Nature’s Rarest Color.” ...

Photograph by Joel Sartore/National Geographic Surprisingly, blue is a rare color in nature because it is very difficult to make. The blue poison dart frog is neither blue because of natural ...

Jerry Parsons, a horticulturist at Texas Cooperative Extension, created several varieties of bluebonnets during his career, ...

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Laid out like an orchestra in a quiet gallery room, 40 colorful gems have one of the planet’s most distinguished conductors: ...

From brilliant blues to fiery reds, discover how nature crafts diamonds in every color, and why some shades are rarer than ...